Make 0.13.1 the default version of localstack

[orlangure]

Since 0.13.0 localstack support lazy loading of services, which should
make the container available faster. This version would now be the
default, but 0.12.2 which was the default before now has its own test to
make sure it still works.

Closes #356

[codecov-commenter]

Codecov Report

Merging #391 (5a5d4d3) into master (dc391b6) will decrease coverage by 1.46%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #391      +/-   ##
==========================================
- Coverage   85.98%   84.52%   -1.47%     
==========================================
  Files          48       48              
  Lines        2255     2255              
==========================================
- Hits         1939     1906      -33     
- Misses        164      195      +31     
- Partials      152      154       +2     

Impacted Files	Coverage Δ
preset/localstack/preset.go	93.02% <100.00%> (ø)
preset/cassandra/options.go	0.00% <0.00%> (-100.00%)	⬇️
preset/cassandra/preset.go	3.44% <0.00%> (-89.66%)	⬇️
preset/postgres/preset.go	84.21% <0.00%> (-2.64%)	⬇️
docker.go	90.09% <0.00%> (-1.00%)	⬇️

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