Add PyLint as a development dependency

Use `pylint calsocial` to run the static analysis.

calsocial/models.py

@@ -74,6 +74,7 @@ class User(db.Model, UserMixin):
     """
 
     __tablename__ = 'users'
+    # pylint: disable=invalid-name
     id = db.Column(db.Integer(), primary_key=True)
 
     #: The username of the user.  This is also the display name and thus is immutable
@@ -132,11 +133,12 @@ class User(db.Model, UserMixin):
         return f'<User {self.id}({self.username})>'
 
 
-class Role(db.Model, RoleMixin):
+class Role(db.Model, RoleMixin):  # pylint: disable=too-few-public-methods
     """Database model for roles
     """
 
     __tablename__ = 'roles'
+    # pylint: disable=invalid-name
     id = db.Column(db.Integer(), primary_key=True)
 
     #: The name of the role
@@ -175,6 +177,7 @@ class Event(db.Model):
     """
 
     __tablename__ = 'events'
+    # pylint: disable=invalid-name
     id = db.Column(db.Integer(), primary_key=True)
 
     #: The ID of the user who created the event