Turn off default features of decimal and enable decimal128 in the docs (#127)

Author: est31

Cargo.toml

@@ -34,9 +34,12 @@ time = "0.1"
 linked-hash-map = "0.5"
 hex = "0.3"
 md5 = "0.6"
-decimal = { version = "2.0.4", optional = true }
+decimal = { version = "2.0.4", default_features = false, optional = true }
 
 [dev-dependencies]
 assert_matches = "1.2"
 serde_derive = "1.0"
 serde_bytes = "0.11"
+
+[package.metadata.docs.rs]
+features = ["decimal128"]