Build 4.0.0-preview3

Author: hsbt

Dockerfile

@@ -109,7 +109,7 @@ COPY versions/3.5* /all-ruby/versions/
 RUN rake -j ${j} 3.5.0-preview1
 
 COPY versions/4.0* /all-ruby/versions/
-RUN rake -j ${j} 4.0.0-preview2
+RUN rake -j ${j} 4.0.0-preview2 4.0.0-preview3
 
 COPY lib/* /all-ruby/lib/
 COPY all-ruby /all-ruby/