Update readme and qc criteria

[johandahlberg]

This clarifies that Python 3.5+ is required by CheckQC in the README. It also updates the quality criteria to the once currently used at the SNP&SEQ Technology Platform.

[codecov[bot]]

Codecov Report

Merging #37 into master will increase coverage by 1%. The diff coverage is n/a.

@@         Coverage Diff          @@
##           master   #37   +/-   ##
====================================
+ Coverage      91%   91%   +1%     
====================================
  Files          17    17           
  Lines         624   624           
====================================
+ Hits          562   563    +1     
+ Misses         62    61    -1

Impacted Files	Coverage Δ
checkQC/app.py	90% <0%> (ø)	:arrow_up:
checkQC/handlers/qc_handler.py	93% <0%> (+2%)	:arrow_up:

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[johandahlberg]

I have addressed your comments now @monikaBrandt.

[monikaBrandt]

Great!