Remove pre-julia 0.7 code

[coveralls]

Pull Request Test Coverage Report for Build 1083914470

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 15 unchanged lines in 7 files lost coverage.
• Overall coverage increased (+7.1%) to 87.478%

---

Files with Coverage Reduction	New Missed Lines	%
src/DiversityMeasure.jl	1	93.27%
src/Partition.jl	1	90.0%
src/Phylogenetics.jl	1	84.09%
src/Iterators.jl	2	72.73%
src/API.jl	3	77.27%
src/Interface.jl	3	58.06%
src/Types.jl	4	82.35%
<!--	Total:	15		-->

Totals
Change from base Build 779067734:	7.1%
Covered Lines:	503
Relevant Lines:	575

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💛 - Coveralls

[codecov-commenter]

Codecov Report

Merging #41 (9654d40) into dev (ddd4083) will increase coverage by 1.57%. The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev      #41      +/-   ##
==========================================
+ Coverage   80.48%   82.05%   +1.57%     
==========================================
  Files          15       15              
  Lines         625      613      -12     
==========================================
  Hits          503      503              
+ Misses        122      110      -12     

Impacted Files	Coverage Δ
src/Iterators.jl	59.09% <ø> (+12.66%)	:arrow_up:

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