anyproxy 最新版本启动失败 回滚到 3.8.0 没有任何问题

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#### Which platform are you running AnyProxy

Ubuntu 16.0.4
#### The version of the AnyProxy

AnyProxy:4.0.11
Node:v11.4.0
#### Your expected behavior of AnyProxy

正常启动
#### The actual behavior of AnyProxy

未能正常启动
#### The log of the error

```
[AnyProxy ERROR][2018-12-26 23:26:00]: RangeError: Array buffer allocation failed
[AnyProxy ERROR][2018-12-26 23:26:00]: RangeError: Array buffer allocation failed
at new ArrayBuffer ()
at Object. (/root/.nvm/versions/node/v11.4.0/lib/node_modules/anyproxy/node_modules/brotli/build/encode.js:21:207)
at Module._compile (internal/modules/cjs/loader.js:723:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:734:10)
at Module.load (internal/modules/cjs/loader.js:620:32)
at tryModuleLoad (internal/modules/cjs/loader.js:560:12)
at Function.Module._load (internal/modules/cjs/loader.js:552:3)
at Module.require (internal/modules/cjs/loader.js:659:17)
at require (internal/modules/cjs/helpers.js:22:18)
at Object. (/root/.nvm/versions/node/v11.4.0/lib/node_modules/anyproxy/node_modules/brotli/compress.js:1:76)
at Module._compile (internal/modules/cjs/loader.js:723:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:734:10)
at Module.load (internal/modules/cjs/loader.js:620:32)
at tryModuleLoad (internal/modules/cjs/loader.js:560:12)
at Function.Module._load (internal/modules/cjs/loader.js:552:3)
at Module.require (internal/modules/cjs/loader.js:659:17)
```

Reproduce startup on Ubuntu 16.04 with AnyProxy 4.0.11 and Node v11.4.0, using the reported RangeError stack as the starting point. Inspect the failing dependency paths node_modules/brotli/build/encode.js and node_modules/brotli/compress.js, then verify that AnyProxy starts without the array-buffer allocation error while the reported older version remains a comparison point.

Written by the indexing model from the issue text.