Update solc-x (#1430)

* Update solc-x and change some functions

* make some changes

* update requirements

mythril/ethereum/util.py

@@ -125,25 +125,14 @@ def solc_exists(version):
     :return:
     """
 
-    solc_binaries = []
     default_binary = "/usr/bin/solc"
     if sys.version_info[1] >= 6:
         if platform.system() == "Darwin":
             solcx.import_installed_solc()
-        installed = solcx.get_installed_solc_versions()
-        if "v" + version in installed:
-            solcx.set_solc_version("v" + version)
-            solc_binary = solcx.install.get_executable()
-            return solc_binary
-        else:
-            available = solcx.get_available_solc_versions()
-            if "v" + version in available:
         solcx.install_solc("v" + version)
         solcx.set_solc_version("v" + version)
         solc_binary = solcx.install.get_executable()
         return solc_binary
-            elif Version("0.4.2") <= Version(version) <= Version("0.4.9"):
-                return None
     elif Version("0.4.2") <= Version(version) <= Version("0.4.25"):
         if not solc.main.is_solc_available():
             solc.install_solc("v" + version)

requirements.txt

@@ -18,7 +18,7 @@ persistent>=4.2.0
 plyvel
 py-flags
 py-evm==0.3.0a13
-py-solc-x==0.10.1
+py-solc-x==1.0.0
 py-solc
 pytest>=3.6.0
 pytest-cov

setup.py

@@ -30,7 +30,7 @@ REQUIRED = [
     "z3-solver>=4.8.5.0",
     "requests>=2.22.0",
     "py-solc",
-    "py-solc-x==0.10.1",
+    "py-solc-x==1.0.0",
     "semantic_version==2.8.5",
     "plyvel",
     "eth_abi==1.3.0",