init not working on macOS

Nobody has claimed this yet.

Unsure on what is happening but `refresh init` is not creating the default yml file.
Note that the `refresh.yml.bak` file is just my backup file to submit this issue.
Also note that the project is outside GOPATH and it seems to make no difference if `GO111MODULE=on` is set.

```
> ls -l
total 24088
-rw-r--r--@ 1 gus staff 130 25 Aug 18:28 Makefile
-rwxr-xr-x 1 gus staff 12272428 25 Aug 18:26 backend*
-rw------- 1 gus staff 2930 25 Aug 18:24 go.mod
-rw------- 1 gus staff 39189 25 Aug 18:24 go.sum
-rw-r--r--@ 1 gus staff 2235 25 Aug 17:38 main.go
drwxr-xr-x 5 gus staff 160 25 Aug 12:52 pkg/
-rw-r--r--@ 1 gus staff 997 25 Aug 18:27 refresh.yml.bak
drwxr-xr-x 4 gus staff 128 25 Aug 14:27 vendor/
> refresh init
Refresh (1.4.0)

> ls -l
total 24088
-rw-r--r--@ 1 gus staff 130 25 Aug 18:28 Makefile
-rwxr-xr-x 1 gus staff 12272428 25 Aug 18:26 backend*
-rw------- 1 gus staff 2930 25 Aug 18:24 go.mod
-rw------- 1 gus staff 39189 25 Aug 18:24 go.sum
-rw-r--r--@ 1 gus staff 2235 25 Aug 17:38 main.go
drwxr-xr-x 5 gus staff 160 25 Aug 12:52 pkg/
-rw-r--r--@ 1 gus staff 997 25 Aug 18:27 refresh.yml.bak
drwxr-xr-x 4 gus staff 128 25 Aug 14:27 vendor/
```

Unable to get any more verbose output from the binary.

`refresh run` runs without the config file but does not work:

```
> refresh run
Refresh (1.4.0)

2019/08/25 18:32:49 No configuration loaded, proceeding with defaults
refresh: 2019/08/25 18:32:49 === Rebuild on: :start: ===
refresh: 2019/08/25 18:32:49 === Running: go build -v -o (PID: 48379) ===
refresh: 2019/08/25 18:32:50 === Building Completed (PID: 48379) (Time: 759.844718ms) ===
refresh: 2019/08/25 18:32:50 === fork/exec : no such file or directory
===
```

However it works fine when I manually create a `refresh.yml` file.

Start by reproducing `refresh init` and `refresh run` on macOS with the command output shown. Inspect the CLI paths responsible for creating the default configuration and launching the rebuilt binary; done means `refresh init` creates `refresh.yml` and `refresh run` executes successfully without a manually created config.

Written by the indexing model from the issue text.