Dropping python3.6 support

Author: bsipocz

CHANGES.rst

@@ -65,6 +65,7 @@ Infrastructure, Utility and Other Changes and Additions
 
 - Fixed progressbar download to report the correct downloaded amount. [#2091]
 
+- Dropping Python 3.6 support. [#2102]
 
 
 0.4.2 (2021-05-14)

README.rst

@@ -42,7 +42,7 @@ website <http://simbad.u-strasbg.fr/simbad/>`_, use the ``simbad`` sub-package:
 Installation and Requirements
 -----------------------------
 
-Astroquery works with Python 3.6 or later.
+Astroquery works with Python 3.7 or later.
 As an `astropy`_ affiliate, astroquery requires `astropy`_ version 3.1.2 or later.
 
 astroquery uses the `requests <http://docs.python-requests.org/en/latest/>`_

docs/index.rst

@@ -68,11 +68,11 @@ The development version can be obtained and installed from github:
 Requirements
 ------------
 
-Astroquery works with Python 3.6 or later.
+Astroquery works with Python 3.7 or later.
 
 The following packages are required for astroquery installation & use:
 
-* `numpy <http://www.numpy.org>`_ >= 1.14
+* `numpy <http://www.numpy.org>`_ >= 1.15
 * `astropy <http://www.astropy.org>`__ (>=3.1.2)
 * `pyVO`_ (>=1.1)
 * `requests <http://docs.python-requests.org/en/latest/>`_