Develop to master merge, release v5.31.0

[alexskr]

v5.31.0 release includes:

• Fix: rename values with no language tags from "none" to :none #154
• Fix: ttl format insert by disabling the chunk insert for that format #156

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 86.98%. Comparing base (33583fd) to head (70007fa).
Report is 3 commits behind head on master.

Files	Patch %	Lines
lib/goo/sparql/client.rb	63.63%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #157      +/-   ##
==========================================
- Coverage   87.05%   86.98%   -0.08%     
==========================================
  Files          36       36              
  Lines        2626     2627       +1     
==========================================
- Hits         2286     2285       -1     
- Misses        340      342       +2     

Flag	Coverage Δ
unittests	86.98% <73.33%> (-0.08%)	⬇️

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