bump OpenCV version to 4.1.0

fix macOS deployment phase

update README

try to disable __STRICT_ANSI__ on 32-bit linux

simplify regex

update variable value

bump OpenCV to 3.4.3

Merge pull request opencv#111 from kvalev/patch-1

Create x86_64 Linux wheels for Python 3.7

add missing identifier for 3.7

bump OpenCV version to 3.4.1