ENH: Do not build 3.6 wheels on Linux

Author: thewtex

scripts/internal/manylinux-build-common.sh

@@ -16,7 +16,7 @@ if [[ $# -eq 0 ]]; then
   PYBIN=(/opt/python/*/bin)
   PYBINARIES=()
   for version in "${PYBIN[@]}"; do
-    if [[ ${version} == *"cp36"* || ${version} == *"cp37"* || ${version} == *"cp38"* || ${version} == *"cp39"* ]]; then
+    if [[ ${version} == *"cp37"* || ${version} == *"cp38"* || ${version} == *"cp39"* ]]; then
       PYBINARIES+=(${version})
     fi
   done