Pinned go-autorest to v13.3.3

Azure/go-autorest version less than v12.0.0 causes ambiguous imports.
Though it's not agola direct dependency, it causes problem when others
use agola.io/agola as dependency.

So pinning Azure/go-autorest to v1.13.3 to prevent this issue.

See: Azure/go-autorest#414

go.mod

@@ -80,3 +80,5 @@ require (
 )
 
 replace github.com/docker/docker v1.13.1 => github.com/docker/engine v0.0.0-20181106193140-f5749085e9cb
+
+replace github.com/Azure/go-autorest => github.com/Azure/go-autorest v13.3.3+incompatible

go.sum

@@ -6,7 +6,7 @@ code.gitea.io/sdk/gitea v0.11.0/go.mod h1:z3uwDV/b9Ls47NGukYM9XhnHtqPh/J+t40lsUr
 github.com/Azure/azure-sdk-for-go v19.1.1+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
-github.com/Azure/go-autorest v10.15.5+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
+github.com/Azure/go-autorest v13.3.3+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
 github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
 github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
 github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA=