bug SSL update

### Step 1: Please describe your environment

* ZeroNet version: 0.6.4 rev3703
* Operating system: macOS 10.14.3
* Web browser: firefox or safari
* Tor status: /always/
* Opened port: no
* Special configuration: ____

### Step 2: Describe the problem:
```
Downloading from: https://github.com/HelloZeroNet/ZeroNet/archive/master.zip Error downloading update from https://github.com/HelloZeroNet/ZeroNet/archive/master.zip: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:661)
Downloading from: https://gitlab.com/HelloZeroNet/ZeroNet/repository/archive.zip?ref=master Error downloading update from https://gitlab.com/HelloZeroNet/ZeroNet/repository/archive.zip?ref=master: EOF occurred in violation of protocol (_ssl.c:661)
Downloading from: https://try.gogs.io/ZeroNet/ZeroNet/archive/master.zip Error downloading update from https://try.gogs.io/ZeroNet/ZeroNet/archive/master.zip: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:661)
Update error: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:661)
```
#### Steps to reproduce:

updating problem with sslv1

but on update manually this error:

```
SiNaPsE at null in /Applications/ZeroNet.app/Contents/Resources/core
$ python2 update.py
Update site path: /Users/SiNaPsE/Library/Application Support/ZeroNet/data/1UPDatEDxnvHDo7TXvq6AEBARfNkyfxsp, bad_files: 0
Downloading from: https://github.com/HelloZeroNet/ZeroNet/archive/master.zip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Downloaded.
Plugins enabled: ['Sidebar', 'ContentFilter', 'Bigfile', 'MergerSite', 'CryptMessage', 'Chart', 'Trayicon', 'FilePack', 'OptionalManager', 'UiConfig', 'TranslateSite', 'PeerDb', 'AnnounceLocal', 'Cors', 'AnnounceShare', 'Stats', 'Zeroname', 'AnnounceZero', 'Newsfeed'] disabled: ['DonationMessage', 'Dnschain', 'Zeroname-local', 'StemPort', 'UiPassword', 'Bootstrapper', 'Multiuser']
Extracting to /Applications/ZeroNet.app/Contents/Resources/core... . . . . . . . . . . . . . . . . . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Done.
Press enter to exit

SiNaPsE at null in /Applications/ZeroNet.app/Contents/Resources/core
$ /Applications/ZeroNet.app/Contents/MacOS/ZeroNet
- Starting ZeroNet...
ERROR:root:Unhandled exception: signal only works in main thread
Traceback (most recent call last):
File "/Applications/ZeroNet.app/Contents/Resources/core/zeronet.py", line 16, in main
ValueError: signal only works in main thread
Exception in thread Thread-1:
Traceback (most recent call last):
File "threading.pyo", line 801, in __bootstrap_inner
File "threading.pyo", line 754, in run
File "/Applications/ZeroNet.app/Contents/Resources/boot.py", line 157, in main
File "/Applications/ZeroNet.app/Contents/Resources/core/zeronet.py", line 56, in main
ImportError: No module named Config

^CTraceback (most recent call last):
File "/Applications/ZeroNet.app/Contents/Resources/__boot__.py", line 81, in
_run()
File "/Applications/ZeroNet.app/Contents/Resources/__boot__.py", line 66, in _run
exec(compile(source, path, 'exec'), globals(), globals())
File "/Applications/ZeroNet.app/Contents/Resources/boot.py", line 179, in
gui()
File "/Applications/ZeroNet.app/Contents/Resources/boot.py", line 106, in gui
time.sleep(0.1)
KeyboardInterrupt
2019-02-01 16:11:58.506 ZeroNet[26769:266104] ZeroNet Error
2019-02-01 16:11:58.506 ZeroNet[26769:266104] ZeroNet Error

SiNaPsE at null in /Applications/ZeroNet.app/Contents/Resources/core
$
```

Start with update.py and trace the update flow into zeronet.py and boot.py. Reproduce the reported Python 2 command and inspect the SSL download failure alongside the later signal and missing Config errors. Done means the macOS update completes and ZeroNet starts without these reported errors.

索引モデルが issue の本文から書いたものです。