One letter words where not allowed in mappings, now they are

[francescalb]

Description:

Type of change:

• Bug fix.
• New feature.
• Documentation update.

Checklist for the reviewer:

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (70b80d9) 74.78% compared to head (053f200) 74.78%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #117   +/-   ##
=======================================
  Coverage   74.78%   74.78%           
=======================================
  Files          15       15           
  Lines        1285     1285           
=======================================
  Hits          961      961           
  Misses        324      324           

Impacted Files	Coverage Δ
tripper/triplestore.py	81.90% <100.00%> (ø)

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