Pre-release version bumps; test fixes for latest mesh/ganache versions (#2363)

* Use pre-release ver's for tests against deployment

* Pre-release version number bumps

* pin sra_client dev deps to prereleases

for testing against deployed package

* middlewares: incl doctest in tests of deployment

* Unpin mesh, use new snapshot, & pay protocol fees

* .gitignore gen'd wrappers for new contracts

* test build_tx() & support for empty TxParams.from_

* fix doc: fill TAKERAssetAmount, not maker...

python-packages/contract_artifacts/setup.py

@@ -152,7 +152,7 @@ with open("README.md", "r") as file_handle:
 
 setup(
     name="0x-contract-artifacts",
-    version="3.0.0",
+    version="3.0.0.dev2",
     description="0x smart contract compilation artifacts",
     long_description=README_MD,
     long_description_content_type="text/markdown",