#1151 Fix regex of 'rewriteLinks'

[HikaruYasuda]

Response body: [0 => \"http://localhost:8000\",\n 1 => \"//localhost:8000\"\n]
Rewriting options: utils.rewriteLinks({hostname: "localhost:8000"}, "localhost:3000")

Current: [0 => \"//localhost:3000",\n 1 => \"//localhost:3000"\n]
Fixed: [0 => \"//localhost:3000\",\n 1 => \"//localhost:3000\"\n]
#1151

[coveralls]

Coverage remained the same at 97.68% when pulling addfdf6 on HikaruYasuda:issue-1151 into 24d7275 on BrowserSync:master.

[coveralls]

Coverage remained the same at 97.68% when pulling f6008e6 on HikaruYasuda:issue-1151 into 05dc70d on BrowserSync:master.