cleanup and add 3.7 to the README

Author: skvark

README.md

@@ -140,3 +140,4 @@ Currently, builds for following Python versions are provided:
 - 3.4
 - 3.5
 - 3.6
+- 3.7

config.sh

@@ -47,9 +47,6 @@ function pre_build {
     brew info ffmpeg
     echo '-----------------'
 
-    export MACOS_SDK_PATH=`xcrun --sdk macosx --show-sdk-path`
-    export MIN_MACOS_VERSION="10.7"
-
   else
     echo "Running for linux"
   fi

setup.py

@@ -138,8 +138,6 @@ def main():
         cmake_args.append("-DWITH_LAPACK=OFF")  # Some OSX LAPACK fns are incompatible, see
                                                 # https://github.com/skvark/opencv-python/issues/21
         cmake_args.append("-DCMAKE_CXX_FLAGS=-stdlib=libc++")
-        cmake_args.append("-DCMAKE_OSX_SYSROOT=%s" % os.environ['MACOS_SDK_PATH'])
-        cmake_args.append("-DCMAKE_OSX_DEPLOYMENT_TARGET=%s" % os.environ['MIN_MACOS_VERSION'])
 
     if sys.platform.startswith('linux'):
         cmake_args.append("-DWITH_IPP=OFF")   # https://github.com/opencv/opencv/issues/10411