Strategies : treesearch -> explore

[guimarqu]

fix #165

[codecov-io]

Codecov Report

Merging #192 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #192   +/-   ##
=======================================
  Coverage   85.49%   85.49%           
=======================================
  Files          39       39           
  Lines        2386     2386           
=======================================
  Hits         2040     2040           
  Misses        346      346

Impacted Files	Coverage Δ
src/strategies/strategy.jl	100% <ø> (ø)	⬆️
src/Coluna.jl	100% <ø> (ø)	⬆️
src/algorithms/reformulationsolver.jl	95% <100%> (ø)	⬆️
src/strategies/explore/simplestrategies.jl	66.66% <100%> (ø)

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