Upgrade syn to v0.15

Author: h-michael

graphql_client_codegen/Cargo.toml

@@ -11,7 +11,7 @@ failure = "0.1"
 itertools = "0.7"
 lazy_static = "1.0"
 quote = "^0.6"
-syn = "0.14"
+syn = "0.15"
 proc-macro2 = { version = "0.4", features = [] }
 serde = "1.0"
 serde_derive = "1.0"

graphql_query_derive/Cargo.toml

@@ -10,6 +10,6 @@ repository = "https://github.com/tomhoule/graphql-client"
 proc-macro = true
 
 [dependencies]
-syn = "0.14"
+syn = "0.15"
 proc-macro2 = { version = "0.4", features = [] }
 graphql_client_codegen = { path = "../graphql_client_codegen/", version = "0.4.0" }