Docker building and various fixes around the code.

Dockerfile

@@ -0,0 +1,14 @@
+FROM golang:1.13.1-alpine AS build
+
+WORKDIR /discordrone
+COPY . .
+
+RUN CGO_ENABLED=0 go build -tags netgo -ldflags '-w -extldflags "-static"'
+
+FROM alpine:3.10
+LABEL maintainer "Stanislav N. <pztrn@pztrn.name>"
+
+COPY --from=build /discordrone/discordrone /app/discordrone
+RUN apk add --no-cache ca-certificates
+
+ENTRYPOINT [ "/app/discordrone" ]