Upgraded appveyor dockerfile reference to zlib to 1.2.13
Patch: JensG
diff --git a/.gitignore b/.gitignore
index 0ed4729..e7f06a7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -75,6 +75,8 @@
 /compiler/cpp/src/thrift/plugin/gen.stamp
 /compiler/cpp/Debug
 /compiler/cpp/Release
+/compiler/cpp/compiler/Debug
+/compiler/cpp/compiler/Release
 /compiler/cpp/src/thrift/libparse.a
 /compiler/cpp/src/thrift/thriftl.cc
 /compiler/cpp/src/thrift/thrifty.cc