add changelog for v1.0.0-beta.0

CHANGELOG.md

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+# Changelog
+
+## v1.0.0-beta.0
+
+FEATURES
+* [\#5](https://github.com/binance-chain/bsc/pull/5) enable bep2e tokens for faucet
+* [\#14](https://github.com/binance-chain/bsc/pull/14) add cross chain contract to system contract
+* [\#15](https://github.com/binance-chain/bsc/pull/15) Allow liveness slash fail
+
+IMPROVEMENT
+* [\#11](https://github.com/binance-chain/bsc/pull/11) remove redundant gaslimit check 
+
+BUGFIX
+* [\#4](https://github.com/binance-chain/bsc/pull/4) fix validator failed to sync a block produced by itself
+* [\#6](https://github.com/binance-chain/bsc/pull/6) modify params for Parlia consensus with 21 validators 
+* [\#10](https://github.com/binance-chain/bsc/pull/10) add gas limit check in parlia implement
+* [\#13](https://github.com/binance-chain/bsc/pull/13) fix debug_traceTransaction crashed issue