Temporary pin astropy & remove python 3.6 support

This addresses problems with the C.I testing

• Temporarily force astropy<4.3 while we wait for a gwpy release.
• Remove python 3.6 support: we depend on corner which depends on arViz which has dropped python 3.6 based on NEP 29.
• Added the python 3.8 sampler tests

added 1 commit

• 20c0ac4b - Move change to requirements

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added 126 commits

• 20c0ac4b...6d8a5ad1 - 125 commits from branch master
• 7c75298e - Merge branch 'master' into temporary-pin-astropy

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added 1 commit

• 7e338a86 - Only test arViz on python 3.6+

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added 1 commit

• 58e4013f - Fix test

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added 1 commit

• b993a3de - Remove python 3.6 compatibility

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changed title from Temporary pin astropy to Temporary pin astropy & remove python 3.6 support

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approved this merge request

approved this merge request

mentioned in commit b1e02f1d

merged

mentioned in issue #596 (closed)