v0.1.3 released

[anakrish]

Key highlights

• Compatibility with latest OPA release v0.63.0
• Users would want to prefer the new eval_rule over eval_query. eval_rule is faster and easier to use.
• Ruby bindings. Thanks to @thedavemarshall
• serde_json's arbitrary_precision feature is not turned on by default. This causes issues deserializing untagged enums. Reported by @lquerel