update version check for monotonic package

we can modify this if we need to later

Author: mrpollo

requirements.txt

@@ -6,4 +6,4 @@ psutil>=3.0.0
 mock>=1.3.0
 six>=1.9.0
 dronekit-sitl>=3.0,<=3.99999
-monotonic==0.6
+monotonic<1.0

setup.py

@@ -12,7 +12,7 @@
       author='3D Robotics',
       install_requires=[
           'pymavlink>=1.1.62',
-          'monotonic==0.6'
+          'monotonic<1.0'
       ],
       author_email='[email protected], [email protected]',
       classifiers=[