Fix tools

CHANGES.rst

@@ -1,7 +1,7 @@
 Change Log
 ==========
 
-asyncprawcore follows `semantic versioning <http://semver.org/>`_.
+asyncprawcore follows `semantic versioning <https://semver.org/>`_.
 
 Unreleased
 ----------

tools/bump_version.py

@@ -12,6 +12,7 @@ def main():
         )
         return 1
     print(line[len(COMMIT_PREFIX) : -1])
+    return 0
 
 
 if __name__ == "__main__":

tools/set_version.py

@@ -7,7 +7,7 @@
 
 CHANGELOG_HEADER = (
     "Change Log\n==========\n\n"
-    "asyncprawcore follows `semantic versioning <http://semver.org/>`_.\n\n"
+    "asyncprawcore follows `semantic versioning <https://semver.org/>`_.\n\n"
 )
 UNRELEASED_HEADER = "Unreleased\n----------\n\n"
 
@@ -106,9 +106,6 @@ def update_package(version):
 
 def valid_version(version):
     parsed_version = packaging.version.parse(version)
-    if isinstance(parsed_version, packaging.version.LegacyVersion):
-        sys.stderr.write(f"Invalid PEP 440 version: {version}\n")
-        return False
     if parsed_version.local or parsed_version.is_postrelease or parsed_version.epoch:
         sys.stderr.write("epoch, local postrelease version parts are not supported")
         return False