Fix issue parsing version

Author: Jacob Truman

buildrunner/config/loader.py

@@ -19,6 +19,7 @@
 
 import jinja2
 
+from buildrunner import __version__ as buildrunner_version
 from buildrunner.errors import (
     BuildRunnerConfigurationError,
     BuildRunnerVersionError,
@@ -124,27 +125,15 @@ def _validate_version(config: dict) -> None:
     buildrunner. If the config version is greater than the buildrunner version or any parsing error occurs
     it will raise a buildrunner exception.
     """
-    buildrunner_version = None
-
     if not os.path.exists(VERSION_FILE_PATH):
         LOGGER.warning(
             f"File {VERSION_FILE_PATH} does not exist. This could indicate an error with "
             f"the buildrunner installation. Unable to validate version."
         )
         return
 
-    with open(VERSION_FILE_PATH, "r", encoding="utf-8") as version_file:
-        for line in version_file.readlines():
-            if "__version__" in line:
-                try:
-                    version_values = (
-                        line.split("=")[1].strip().replace("'", "").split(".")
-                    )
-                    buildrunner_version = f"{version_values[0]}.{version_values[1]}"
-                except IndexError as exception:
-                    raise ConfigVersionFormatError(
-                        f'couldn\'t parse version from "{line}"'
-                    ) from exception
+    version_values = buildrunner_version.split(".")
+    buildrunner_version = f"{version_values[0]}.{version_values[1]}"
 
     if not buildrunner_version:
         raise BuildRunnerVersionError("unable to determine buildrunner version")