Restrict sh version to sh>=1.10, <2.0 (kivy#2746)

keep sh version under 2.0 as default behaviour was switched

Author: HyTurtle

setup.py

@@ -21,8 +21,8 @@
 # https://github.com/kivy/buildozer/issues/722
 install_reqs = [
     'appdirs', 'colorama>=0.3.3', 'jinja2',
-    'sh>=1.10; sys_platform!="nt"',
-    'pep517<0.7.0', 'toml',
+    'sh>=1.10, <2.0; sys_platform!="nt"',
+    'pep517', 'toml', 'packaging',
 ]
 # (pep517 and toml are used by pythonpackage.py)