fix some small bugs

scripts/bootstrap_history.py

@@ -20,6 +20,7 @@ try:
     from pygithub3 import Github
 except ImportError:
     Github = None
+print(Github)
 from six import string_types
 from six.moves.urllib.parse import urljoin
 
@@ -41,7 +42,7 @@ DEVTEAM = [
     "VJalili"
 ]
 
-TEMPLATE = """
+TEMPLATE = string.Template("""
 .. to_doc
 
 ${release}
@@ -76,7 +77,7 @@ Fixes
 
 .. include:: ${release}_prs.rst
 
-"""
+""")
 
 ANNOUNCE_TEMPLATE = string.Template("""
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