Update version to 0.2.0 in _metadata.py

PiperOrigin-RevId: 338675696
Change-Id: Id80d40dbd89dc9a3bef4419d3a5fadc3e27af232

Author: fastturtle

acme/_metadata.py

@@ -21,8 +21,8 @@
 
 # We follow Semantic Versioning (https://semver.org/)
 _MAJOR_VERSION = '0'
-_MINOR_VERSION = '1'
-_PATCH_VERSION = '8'
+_MINOR_VERSION = '2'
+_PATCH_VERSION = '0'
 
 # Example: '0.4.2'
 __version__ = '.'.join([_MAJOR_VERSION, _MINOR_VERSION, _PATCH_VERSION])