Merge pull request #1183 from ethereum/yann300-patch-11

Update README.md

README.md

@@ -50,6 +50,8 @@ Remix is built out of several different modules:
 + [`remix-lib`](remix-lib/README.md)
 + [`remix-debug`](remix-debug/README.md) allo debuggin transaction.
 + [`remix-tests`](remix-tests/README.md) provides unit testing for solidity.
++ [`remix-astwalker`](remix-tests/README.md) provides a tool for parsing solidity AST.
++ [`remix-url-resolver`](remix-url-resolver/README.md) provides helpers for resolving external content (github, swarm, ipfs, ...).
 + [`remixd`](https://github.com/ethereum/remixd/tree/master) CLI which allow accessing local element from Remix IDE (see https://remix.readthedocs.io/en/latest/tutorial_remixd_filesystem.html)
 
 Each generally has their own npm package and test suite, as well as basic documentation.