Drop Julia 0.6 support

[tkf]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 151

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+1.5%) to 70.833%

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Files with Coverage Reduction	New Missed Lines	%
src/InteractiveCodeSearch.jl	3	74.53%

Totals
Change from base Build 145:	1.5%
Covered Lines:	204
Relevant Lines:	288

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💛 - Coveralls

[codecov-io]

Codecov Report

Merging #8 into master will increase coverage by 6.11%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
+ Coverage   67.31%   73.42%   +6.11%     
==========================================
  Files           4        4              
  Lines         358      350       -8     
==========================================
+ Hits          241      257      +16     
+ Misses        117       93      -24

Impacted Files	Coverage Δ
src/InteractiveCodeSearch.jl	88.27% <100%> (-0.56%)	⬇️
src/return.jl	80% <0%> (+16%)	⬆️
src/taskmanager.jl	93.33% <0%> (+26.66%)	⬆️

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