chore: update versions

Author: dtopuzov

requirements_darwin.txt

@@ -6,7 +6,7 @@ nose-parameterized==0.6.0
 nose==1.3.7
 nose-html-reporting==0.2.3
 Pillow==5.3.0
-numpy==1.17.4
+numpy==1.16.6
 opencv-python==4.1.2.30
 pytesseract==0.3.1
 flake8==3.6.0
@@ -18,6 +18,6 @@ PyObjC==5.1.1
 subprocess32==3.5.3
 requests==2.21.0
 pytz==2018.9
-Appium-Python-Client>=0.50
+Appium-Python-Client==0.50
 pyautogui==0.9.5
 python-xlib==0.25