Merge pull request go-git#1005 from hairyhenderson/update-gcfg-1.4.0

update gcfg dependency to v1.4.0

Author: mcuadros

Diff for: go.mod

@@ -16,7 +16,7 @@ require (
 	github.com/pkg/errors v0.8.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/sergi/go-diff v1.0.0
-	github.com/src-d/gcfg v1.3.0
+	github.com/src-d/gcfg v1.4.0
 	github.com/stretchr/testify v1.2.2 // indirect
 	github.com/xanzy/ssh-agent v0.2.0
 	golang.org/x/crypto v0.0.0-20180904163835-0709b304e793

Diff for: go.sum

@@ -35,6 +35,8 @@ github.com/sergi/go-diff v1.0.0 h1:Kpca3qRNrduNnOQeazBd0ysaKrUJiIuISHxogkT9RPQ=
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
 github.com/src-d/gcfg v1.3.0 h1:2BEDr8r0I0b8h/fOqwtxCEiq2HJu8n2JGZJQFGXWLjg=
 github.com/src-d/gcfg v1.3.0/go.mod h1:p/UMsR43ujA89BJY9duynAwIpvqEujIH/jFlfL7jWoI=
+github.com/src-d/gcfg v1.4.0 h1:xXbNR5AlLSA315x2UO+fTSSAXCDf+Ar38/6oyGbDKQ4=
+github.com/src-d/gcfg v1.4.0/go.mod h1:p/UMsR43ujA89BJY9duynAwIpvqEujIH/jFlfL7jWoI=
 github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/xanzy/ssh-agent v0.2.0 h1:Adglfbi5p9Z0BmK2oKU9nTG+zKfniSfnaMYB+ULd+Ro=