Provide a forced closing of connection

[astares]

Fix #84

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.32% 🎉

Comparison is base (39c101a) 79.71% compared to head (375774a) 80.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
+ Coverage   79.71%   80.04%   +0.32%     
==========================================
  Files         108      108              
  Lines        4328     4359      +31     
==========================================
+ Hits         3450     3489      +39     
+ Misses        878      870       -8     

Files Changed	Coverage Δ
.../SQLite3-Core-Tests/SQLite3ConnectionTest.class.st	98.00% <100.00%> (+0.04%)	⬆️
src/SQLite3-Core/SQLite3BaseConnection.class.st	93.38% <100.00%> (+0.21%)	⬆️
src/SQLite3-Core/SQLite3Library.class.st	67.06% <100.00%> (+1.41%)	⬆️

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