Improved error handling and add ca certificates

Dockerfile

@@ -5,6 +5,6 @@ WORKDIR ${GOPATH}/src/git.jonasfranz.software/JonasFranzDEV/mensabot
 RUN go build
 
 FROM alpine:3.7
-ENV MENSABOT_TOKEN token
+RUN apk --no-cache add ca-certificates
 COPY --from=build-env /go/src/git.jonasfranz.software/JonasFranzDEV/mensabot/mensabot /app/mensabot/mensabot
 ENTRYPOINT ["/app/mensabot/mensabot"] 

bot.go

@@ -35,9 +35,12 @@ func main() {
 		return
 	}
 	dg, err := discordgo.New(fmt.Sprintf("Bot %s", token))
+	if err != nil {
+		fmt.Println("error creating dicord bot: ", err)
+	}
 	canteens, err := openmensa.GetCanteens(175)
 	if err != nil {
-		fmt.Println("error creating discord bot: ", err)
+		fmt.Println("error getting mensa: ", err)
 		return
 	}
 	dg.AddHandler(messageCreate)