Pin dependencies that have stable APIs

Author: bridadan

setup.py

@@ -44,16 +44,16 @@ def read(fname):
     license="Apache-2.0",
     test_suite="test",
     install_requires=[
-        "PySerial>=3.0",
-        "requests",
-        "intelhex",
+        "PySerial>=3.0,<4.0",
+        "requests>=2.0,<3.0",
+        "intelhex>=2.0,<3.0",
         "future",
         "PrettyTable>=0.7.2",
         "fasteners",
-        "appdirs>=1.4",
-        "junit-xml",
+        "appdirs>=1.4,<2.0",
+        "junit-xml>=1.0,<2.0",
         "lockfile",
-        "six",
+        "six>=1.0,<2.0",
         "colorama>=0.3,<0.5",
     ],
     tests_require=["mock>=2", "pytest>=3"],