[add] add NORMALIZE_WHITESPACE and ELLIPSIS to pytest.ini and remove them from requests/__init__.py

pytest.ini

@@ -1,2 +1,3 @@
 [pytest]
-addopts = -p no:warnings --doctest-modules
+addopts = -p no:warnings --doctest-modules
+doctest_optionflags= NORMALIZE_WHITESPACE ELLIPSIS

requests/__init__.py

@@ -24,8 +24,6 @@ Basic GET usage:
    >>> payload = dict(key1='value1', key2='value2')
    >>> r = requests.post('https://httpbin.org/post', data=payload)
    >>> print(r.text)
-   ... # doctest: +ELLIPSIS
-   ... # doctest: +NORMALIZE_WHITESPACE
    {
      ...
      "form": {