Update syn_codegen to quote 0.5
diff --git a/codegen/Cargo.toml b/codegen/Cargo.toml
index db4c2a6..2eba11c 100644
--- a/codegen/Cargo.toml
+++ b/codegen/Cargo.toml
@@ -7,8 +7,7 @@
 
 [dependencies]
 syn = { path = "..", features = ["full", "extra-traits"] }
-#quote = "0.5"
-quote = { git = 'https://github.com/dtolnay/quote' }
+quote = "0.5"
 failure = "0.1"
 inflections = "1.1"
 proc-macro2 = "0.3"