Make 1.0.78 the minimal serde version

It fixes a panic on previous versions in some cases when multiple fields in a struct are marked with #[flatten]. We do that in interfaces.

Author: tomhoule

Cargo.toml

@@ -12,7 +12,7 @@ categories = ["network-programming", "web-programming", "wasm"]
 failure = "0.1"
 graphql_query_derive = {path = "./graphql_query_derive", version = "0.4.0"}
 itertools = "0.7"
-serde = "1.0"
+serde = "^1.0.78"
 serde_derive = "1.0"
 serde_json = "1.0"
 

graphql_client_codegen/Cargo.toml

@@ -13,7 +13,7 @@ lazy_static = "1.0"
 quote = "0.6"
 syn = "0.15"
 proc-macro2 = { version = "0.4", features = [] }
-serde = "1.0"
+serde = "^1.0.78"
 serde_derive = "1.0"
 serde_json = "1.0"
 heck = "0.3"