feat: update gcc version

Sy1v4in · Sy1v4in · commit 531ff145d8ca · 2018-04-09T13:57:49.000+02:00
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-FROM gcc:7.1
+FROM gcc:7.3
 
 COPY entrypoint.sh /
 COPY build.sh /project/build
