Add changelog

Author: Anil Maurya

CHANGELOG.md

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+# 0.4.0
+* load_many accept batch_size parameter to parse documents larger than 1 MB in [PR #5](https://github.com/anilmaurya/fast_jsonparser/pull/5), thanks to [casperisfine](https://github.com/casperisfine)
+* Add option for symbolize_keys, default to true in [PR #9](https://github.com/anilmaurya/fast_jsonparser/pull/9), thanks to [casperisfine](https://github.com/casperisfine)
+* Parse string values as UTF-8 in [PR #10](https://github.com/anilmaurya/fast_jsonparser/pull/10), thanks to [casperisfine](https://github.com/casperisfine)