Update go version to 1.11.5 in the docker file

Author: ccojocar

Dockerfile

@@ -1,11 +1,11 @@
-FROM golang:1.11.1-alpine3.8 as build
+FROM golang:1.11.5-alpine3.9 as build
 WORKDIR /go/src/github.com/securego/gosec
 COPY . .
 RUN apk add -U git make
 RUN go get -u github.com/golang/dep/cmd/dep
 RUN make
 
-FROM golang:1.11.1-alpine3.8
+FROM golang:1.11.5-alpine3.9
 RUN apk add -U gcc musl-dev
 COPY --from=build /go/src/github.com/securego/gosec/gosec /usr/local/bin/gosec
 ENTRYPOINT ["gosec"]