compilers=&python3
defaultCompiler=python36

group.python3.compilers=python35:python36:python37:python38
compiler.python35.name=Python 3.5
compiler.python35.exe=/opt/compiler-explorer/python-3.5.9/bin/python3.5
compiler.python36.name=Python 3.6
compiler.python36.exe=/opt/compiler-explorer/python-3.6.10/bin/python3.6
compiler.python37.name=Python 3.7
compiler.python37.exe=/opt/compiler-explorer/python-3.7.6/bin/python3.7
compiler.python38.name=Python 3.8
compiler.python38.exe=/opt/compiler-explorer/python-3.8.1/bin/python3.8

compilers=&python3
defaultCompiler=python39

group.python3.compilers=python35:python36:python37:python38:python39
compiler.python35.name=Python 3.5
compiler.python35.exe=/opt/compiler-explorer/python-3.5.9/bin/python3.5
compiler.python36.name=Python 3.6
compiler.python36.exe=/opt/compiler-explorer/python-3.6.10/bin/python3.6
compiler.python37.name=Python 3.7
compiler.python37.exe=/opt/compiler-explorer/python-3.7.6/bin/python3.7
compiler.python38.name=Python 3.8
compiler.python38.exe=/opt/compiler-explorer/python-3.8.1/bin/python3.8
compiler.python39.name=Python 3.9
compiler.python39.exe=/opt/compiler-explorer/python-3.9.6/bin/python3.9

Add python 3.9 and make it the default. CC @mCodingLLC
Add python 3.9 and make it the default. CC @mCodingLLC
