Git cloning error: Proxy CONNECT aborted
Error on install package. Git downloading with nimble not work on windows 7 SP 1 64x. But git cloning without nimble work. Yes, internet with proxy.
```
C:\Windows\system32>nimble --version
nimble v0.8.10 compiled at 2018-03-01 23:02:21
git hash: 6a2da5627c029460f6f714a44f5275762102fa4b

C:\Windows\system32>nimble install nimx --verbose
    Reading official package list
Downloading https://github.com/yglukhov/nimx using git
     Error: Execution failed with exit code 128
        ... Command: git clone --recursive --depth 1 https://github.com/yglukhov
/nimx C:\...\Temp\nimble_352\githubcom_yglukhovnimx
        ... Output: Cloning into 'C:\...\Temp\nimble_35
2\githubcom_yglukhovnimx'...
        ... fatal: unable to access 'https://github.com/yglukhov/nimx/': Proxy CONNECT aborted

C:\Windows\system32>git --version
git version 2.12.2.windows.2

C:\Windows\system32>git clone --recursive --depth 1 https://github.com/yglukhov/
nimx C:\...\Temp\nimble_352\githubcom_yglukhovnimx
Cloning into 'C:\...\Temp\nimble_352\githubcom_yglukhov
nimx'...
remote: Counting objects: 225, done.
remote: Compressing objects: 100% (210/210), done.
remote: Total 225 (delta 6), reused 70 (delta 1), pack-reused 0R
:  95% (214/225), 532.00 KiB | 494.00 KiB/s
Receiving objects: 100% (225/225), 602.16 KiB | 494.00 KiB/s, done.
Resolving deltas: 100% (6/6), done.
```