Removed deprecated MAINTAINER in dockerfile and Resolves #86

Dockerfile

@@ -1,7 +1,5 @@
 FROM golang:alpine AS builder
 
-MAINTAINER "Yoginth <yoginth@protonmail.com>"
-
 # Install build deps
 RUN apk --no-cache --no-progress add --virtual build-deps build-base git
 WORKDIR /go/src/gitote/gitote