Forgot an equal sign for travis

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 go:
 - 1.x
-gobuild_args: -x -ldflags "-X main.buildversion $(date -u +.%Y%m%d.%H%M%S)"
+gobuild_args: -x -ldflags "-X main.buildversion=$(date -u +.%Y%m%d.%H%M%S)"
 before_install:
 - sudo apt-get install gcc-mingw-w64 gcc-mingw-w64-i686 gcc-mingw-w64-x86-64 binutils-mingw-w64-i686 binutils-mingw-w64-x86-64
 - go get -u github.com/tools/godep