releasenotes: add import check for fuzzywuzzy

This patch adds the has_fuzzywuzzy for import check of external dependency
fuzzywuzzy.

tests/hghave.py

@@ -652,3 +652,12 b' def has_virtualenv():'
 @check("fsmonitor", "running tests with fsmonitor")
 def has_fsmonitor():
     return 'HGFSMONITOR_TESTS' in os.environ
+
+@check("fuzzywuzzy", "Fuzzy string matching library")
+def has_fuzzywuzzy():
+    try:
+        import fuzzywuzzy
+        fuzzywuzzy.__version__
+        return True
+    except ImportError:
+        return False