Set MICROPY_VERSION environment variable to 1.27.0

Author: MinoruInachi

docs/conf.py

@@ -21,6 +21,8 @@
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 sys.path.insert(0, os.path.abspath('.'))
 
+os.environ['MICROPY_VERSION'] = '1.27.0'
+
 # The members of the html_context dict are available inside topindex.html
 micropy_version = os.getenv('MICROPY_VERSION') or 'latest'
 micropy_all_versions = (os.getenv('MICROPY_ALL_VERSIONS') or 'latest').split(',')