Fix typo in Dockerfile

Fix mistake made on #149
diff --git a/Dockerfile b/Dockerfile
index 49faea2..010cba5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -28,7 +28,7 @@
     dpkg \
     pkg-config \
     nasm \
-    gcc \
+    gcc
 
 RUN mkdir -p /var/maven/.m2/ && chmod -R 777 /var/maven/
-ENV MAVEN_CONFIG=/var/maven/.m2
\ No newline at end of file
+ENV MAVEN_CONFIG=/var/maven/.m2