Don't build driver for chrono/json/uuid/time/etc unless explicitly as…

…ked (#328)

Cargo.toml files can use the "?" operator in their sub-dependencies to avoid
building the main dependency unless it is explicitly enabled by another feature

This uses that operator to avoid building the driver crate for
chrono/json/uuid/time/etc unless the driver crate is already enabled
explicitly

Fixes #327

Cargo.toml

@@ -68,20 +68,20 @@ postgres-json = ["with-json", "postgres-types/with-serde_json-1"]
 postgres-rust_decimal = ["with-rust_decimal", "rust_decimal/db-postgres"]
 postgres-bigdecimal = ["with-bigdecimal"]
 postgres-uuid = ["with-uuid", "postgres-types/with-uuid-0_8"]
-postgres-array = ["postgres-types/array-impls", "sea-query-driver/postgres-array"]
+postgres-array = ["postgres-types/array-impls", "sea-query-driver?/postgres-array"]
 postgres-interval = ["proc-macro2", "quote"]
 postgres-time = ["with-time", "postgres-types/with-time-0_2"]
 rusqlite = ["sea-query-driver/rusqlite"]
 sqlx-mysql = ["sea-query-driver/sqlx-mysql"]
 sqlx-postgres = ["sea-query-driver/sqlx-postgres"]
 sqlx-sqlite = ["sea-query-driver/sqlx-sqlite"]
 thread-safe = []
-with-chrono = ["chrono", "sea-query-driver/with-chrono"]
-with-json = ["serde_json", "sea-query-driver/with-json"]
-with-rust_decimal = ["rust_decimal", "sea-query-driver/with-rust_decimal"]
-with-bigdecimal = ["bigdecimal", "sea-query-driver/with-bigdecimal"]
-with-uuid = ["uuid", "sea-query-driver/with-uuid"]
-with-time = ["time", "sea-query-driver/with-time"]
+with-chrono = ["chrono", "sea-query-driver?/with-chrono"]
+with-json = ["serde_json", "sea-query-driver?/with-json"]
+with-rust_decimal = ["rust_decimal", "sea-query-driver?/with-rust_decimal"]
+with-bigdecimal = ["bigdecimal", "sea-query-driver?/with-bigdecimal"]
+with-uuid = ["uuid", "sea-query-driver?/with-uuid"]
+with-time = ["time", "sea-query-driver?/with-time"]
 
 [[test]]
 name = "test-derive"