fix: remove limitation on installable solidity compilers for CI

tests/conftest.py

@@ -15,7 +15,6 @@
 from ethpm._utils.ipfs import dummy_ipfs_pin
 from ethpm.backends.ipfs import BaseIPFSBackend
 from prompt_toolkit.input.defaults import create_pipe_input
-from semantic_version import Version
 
 import brownie
 from brownie._cli.console import Console
@@ -96,27 +95,6 @@ def pytest_generate_tests(metafunc):
         metafunc.parametrize("evmtester", params, indirect=True)
 
 
-# travis cannot call github ethereum/solidity API, so this method is patched
-def pytest_sessionstart(session):
-    if not session.config.getoption("--evm"):
-        monkeypatch_session = MonkeyPatch()
-        monkeypatch_session.setattr(
-            "solcx.get_installable_solc_versions",
-            lambda: [
-                Version("0.6.7"),
-                Version("0.6.2"),
-                Version("0.6.0"),
-                Version("0.5.15"),
-                Version("0.5.8"),
-                Version("0.5.7"),
-                Version("0.5.0"),
-                Version("0.4.25"),
-                Version("0.4.24"),
-                Version("0.4.22"),
-            ],
-        )
-
-
 @pytest.fixture(scope="session")
 def network_name():
     return _dev_network

tests/project/compiler/test_solidity.py

@@ -53,6 +53,21 @@ def msolc(monkeypatch):
     ]
     monkeypatch.setattr("solcx.get_installed_solc_versions", lambda: installed)
     monkeypatch.setattr("solcx.install_solc", lambda k, **z: installed.append(k))
+    monkeypatch.setattr(
+        "solcx.get_installable_solc_versions",
+        lambda: [
+            Version("0.6.7"),
+            Version("0.6.2"),
+            Version("0.6.0"),
+            Version("0.5.15"),
+            Version("0.5.8"),
+            Version("0.5.7"),
+            Version("0.5.0"),
+            Version("0.4.25"),
+            Version("0.4.24"),
+            Version("0.4.22"),
+        ],
+    )
     yield installed