Do not make object inheritance

This patch removes these lintian warnings:

Warning R0205: Class 'X' inherits from object,
can be safely removed from bases in python3 (useless-object-inheritance)

contrib/helpers.py

@@ -39,7 +39,7 @@ def goTo(path):
     return False
 
 
-class Author(object):
+class Author():
     def __init__(self, name, count, email):
         self.name = name
         self.count = count
@@ -55,7 +55,7 @@ class Author(object):
         return self.email
 
 
-class Git(object):
+class Git():
     @staticmethod
     def getShortlog(ref):
         shortlog = ""
@@ -199,7 +199,7 @@ class Git(object):
         chdir(topLevel)
 
 
-class OfflineimapInfo(object):
+class OfflineimapInfo():
     def getVersion(self):
         cmd = shlex.split("./offlineimap.py --version")
         return run(cmd).rstrip().decode(FS_ENCODING)
@@ -209,7 +209,7 @@ class OfflineimapInfo(object):
 
 
 
-class User(object):
+class User():
     """Interact with the user."""
 
     @staticmethod
@@ -235,7 +235,7 @@ class User(object):
         return False
 
 
-class Tester(object):
+class Tester():
     def __init__(self, name, email, feedback):
         self.name = name
         self.email = email
@@ -264,7 +264,7 @@ class Tester(object):
         self.feedback = not self.feedback
 
 
-class Testers(object):
+class Testers():
     def __init__(self):
         self.testers = None
         self._read()

contrib/release.py

@@ -89,7 +89,7 @@ Have fun! ,-)
 """
 
 
-class State(object):
+class State():
     def __init__(self):
         self.master = None
         self.next = None
@@ -129,7 +129,7 @@ class State(object):
                 goTo('..')
 
 
-class Changelog(object):
+class Changelog():
     def __init__(self):
         self.shouldUsePrevious = False
 
@@ -214,7 +214,7 @@ class Changelog(object):
         return dict_Content
 
 
-class Announce(object):
+class Announce():
     def __init__(self, version):
         self.fd = open(ANNOUNCE_FILE, 'w')
         self.version = version
@@ -258,7 +258,7 @@ Pip:
         self.fd.close()
 
 
-class Website(object):
+class Website():
     def updateUploads(self):
         req = ("add new archive to uploads/ on the website? "
                "(warning: checksums will change if it already exists)")
@@ -333,7 +333,7 @@ Then, commit and push changes of the website.""".format(SPHINXBUILD, DOCSDIR)))
         return branchName
 
 
-class Release(object):
+class Release():
     def __init__(self):
         self.state = State()
         self.offlineimapInfo = OfflineimapInfo()

contrib/tested-by.py

@@ -14,7 +14,7 @@ import argparse
 from helpers import CACHEDIR, EDITOR, Testers, User, Git
 
 
-class App(object):
+class App():
     def __init__(self):
         self.args = None
         self.testers = Testers()