build(enum34): remove enum34 dependency from setup

This commit removes the enum34 dependency from the core library as the enum34 dependency is not needed since Python version 3.4 and we support Python version >= 3.7.

closes #59

setup.py

@@ -12,7 +12,7 @@
 
 setup(
     name='apimatic-core',
-    version='0.2.11',
+    version='0.2.12',
     description='A library that contains core logic and utilities for '
                 'consuming REST APIs using Python SDKs generated by APIMatic.',
     long_description=long_description,
@@ -27,7 +27,6 @@
         'jsonpickle~=3.0.1, >= 3.0.1',
         'python-dateutil~=2.8.1',
         'requests~=2.31',
-        'enum34~=1.1, >=1.1.10',
         'setuptools>=68.0.0',
         'jsonpointer~=2.3'
     ],