bump version to 0.1.11 (#298)

packages/contracts/CHANGELOG.md

 # Changelog
 
+## v0.1.11
+- cleanup: ECDSAContractAccount
+- cleanup: Proxy_EOA
+- cleanup: StateManagerFactory
+- cleanup: Bytes32Utils
+- cleanup: Minor cleanup to state manager
+- cleanup: SafetyChecker
+- Remove gas estimators from gateway interface
+- Add ERC1820 Registry as a precompile
+- dev: Remove usage of custom concat function in Solidity
+- Fix revert string generated by EM wrapper
+- Update OVM_L1ERC20Gateway.sol
+- Move OVM_BondManager test into the right location
+
 ## v0.1.10
 Adds extensible ERC20Gateway and Improve CI.
 

packages/contracts/package.json

 {
   "name": "@eth-optimism/contracts",
-  "version": "0.1.10",
+  "version": "0.1.11",
   "main": "build/src/index.js",
   "files": [
     "build/**/*.js",