feat: ciso8601 as optional dependency #98

Author: rolincova

README.rst

@@ -76,7 +76,7 @@ InfluxDB python library uses `RxPY <https://github.com/ReactiveX/RxPY>`__ - The
 
 .. note::
 
-    The client uses ``ciso8601`` for parsing dates. ``ciso8601`` is much faster than built-in Python datetime. Since it's written as a ``C`` module the best way is build it from sources:
+    It is recommended to use ``ciso8601`` with client for parsing dates. ``ciso8601`` is much faster than built-in Python datetime. Since it's written as a ``C`` module the best way is build it from sources:
 
     **Windows**:
 
@@ -93,7 +93,7 @@ The python package is hosted on `PyPI <https://pypi.org/project/influxdb-client/
 
 .. code-block:: sh
 
-   pip install influxdb-client
+   pip install influxdb-client[ciso]
 
 Then import the package:
 

setup.py

@@ -13,6 +13,9 @@
 with open('extra-requirements.txt', 'r') as f:
     extra_requires = [x.strip() for x in f if x.strip()]
 
+with open('ciso-requirements.txt', 'r') as f:
+    ciso_requires = [x.strip() for x in f if x.strip()]
+
 with open('README.rst', 'r') as f:
     readme = f.read()
 
@@ -32,13 +35,13 @@
     keywords=["InfluxDB", "InfluxDB Python Client"],
     tests_require=test_requires,
     install_requires=requires,
-    extras_require={'extra': extra_requires},
+    extras_require={'extra': extra_requires, 'ciso': ciso_requires},
     long_description_content_type="text/x-rst",
     packages=find_packages(),
     test_suite='tests',
     python_requires='>=3.6',
     include_package_data=True,
-    data_files=['requirements.txt', 'extra-requirements.txt', 'test-requirements.txt'],
+    data_files=['requirements.txt', 'extra-requirements.txt', 'test-requirements.txt', 'ciso-requirements.txt'],
     classifiers = [
         'Development Status :: 4 - Beta',
         'Intended Audience :: Developers',