Add missing __init__.py file in modules

Author: mesudip

README.md

@@ -20,7 +20,7 @@ import json
 from certapi import FileSystemChallengeStore, FilesystemKeyStore, CertAuthority
 
 key_store = FilesystemKeyStore("data")
-challenge_store = FileSystemChallengeStore("./acme-challenges")  # this should be where your web server hosts the .well-known/acme-challenges.
+challenge_store = FileSystemChallengeStore("./acme-challenges")  # this should be where your web server hosts the .well-known/
 
 certAuthority = CertAuthority(challenge_store, key_store)
 certAuthority.setup()

setup.py

@@ -2,7 +2,7 @@
 
 setup(
     name="certapi",
-    version="0.3.1",
+    version="0.4.1",
     packages=find_packages(where="src"),
     package_dir={"": "src"},
     install_requires=[