updates as per PR guidance

Author: itsjayway

src/footprint/azext_footprint/azext_metadata.json

@@ -1,4 +1,4 @@
 {
-    "azext.isExperimental": true,
+    "azext.isPreview": true,
     "azext.minCliCoreVersion": "2.11.0"
 }

src/footprint/setup.py

@@ -10,7 +10,7 @@
 from setuptools import setup, find_packages
 
 # HISTORY.rst entry.
-VERSION = '1.0.1'
+VERSION = '1.0.1b1'
 
 # The full list of classifiers is available at
 # https://pypi.python.org/pypi?%3Aaction=list_classifiers