Update "Dockerfile" to use "go" directly since "docker:1.10-git" is n…

…ow based on Alpine 3.4 (which has Go 1.6.3)

Dockerfile

@@ -1,13 +1,10 @@
 FROM docker:1.10-git
 
-# add "edge" since Alpine 3.3 only has Go 1.5 and we need 1.6+
-RUN sed -ri -e 'p; s!^!@edge !; s!v[0-9.]+!edge!' /etc/apk/repositories
-
 RUN apk add --no-cache \
 # bash for running scripts
 		bash \
 # go for compiling bashbrew
-		go@edge
+		go
 
 ENV GOPATH /go
 ENV PATH $GOPATH/bin:$PATH