update Stencil to 0.10.1

Plugin/Package.swift

@@ -26,6 +26,6 @@ let package = Package(
   ],
   dependencies: [
     .Package(url: "https://github.com/apple/swift-protobuf.git", Version(1,0,2)),
-    .Package(url: "https://github.com/kylef/Stencil.git", Version(0,9,0))
+    .Package(url: "https://github.com/kylef/Stencil.git", Version(0,10,1))
   ]
 )