octokit client should follow proxy settings (#314)

src/tool-cache.ts

@@ -5,7 +5,7 @@ import * as os from 'os'
 import * as path from 'path'
 import * as httpm from '@actions/http-client'
 import * as semver from 'semver'
-import * as uuidV4 from 'uuid/v4'
+import uuidV4 from 'uuid/v4'
 import {exec} from '@actions/exec/lib/exec'
 import {ExecOptions} from '@actions/exec/lib/interfaces'
 import {ok} from 'assert'