build(enum34): remove enum34 dependency from setup (#61)

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'
     ],