[1.1.x] set package long description | Switch to setuptools | adding appropriate 'type' to sleep variable | adding appropriate 'type' to sleep variable | Add testing for py38-dev and remove py34 | whisper-fil

[deniszh]

Backports the following commits to 1.1.x:

• set package long description (set package long description #271)
• Switch to setuptools (Switch to setuptools #272)
• adding appropriate 'type' to sleep variable (adding appropriate 'type' to sleep variable in contrib/update-storage-times.py #273)
• adding appropriate 'type' to sleep variable (adding appropriate 'type' to sleep variable in contrib/update-storage-times.py #273)
• Add testing for py38-dev and remove py34 (Add testing for Python 3.8, remove 3.4 (eol) #277)
• whisper-fill: fix indentation (Add testing for Python 3.8, remove 3.4 (eol) #277)
• Altering rrd2whisper.py to use listcomp instead of filter() for py3 compatibility with len(), to fix rrd2whisper len(filter(...)) fails on python3 #278 (Altering rrd2whisper.py to use listcomp instead of filter() for py3 c… #280)
• Update rrd2whisper.py (Altering rrd2whisper.py to use listcomp instead of filter() for py3 c… #280)
• Dump as raw values (Dump as raw values #282)