Increase code coverage

[kellertuer]

Since for the last PR codecov got confused, here's the missing coverage.

There should be 4 lines remaining (and one ambiguity with getindex and static arrays from 1.6 onwards), where the two lines

• We are testing mid_point!also on Julia 1.0, so I am not sure why we miss https://codecov.io/gh/JuliaManifolds/ManifoldsBase.jl/src/master/src/ManifoldsBase.jl#L655
• This function https://codecov.io/gh/JuliaManifolds/ManifoldsBase.jl/src/master/src/PowerManifold.jl#L203 seems to be necessary for avoiding ambiguities, but though we are testing with a CachedBasis, it seems that either still dispatches to the function above or is an error of codecov
• And the remaining line really seems to be an error by codecov https://codecov.io/gh/JuliaManifolds/ManifoldsBase.jl/src/master/src/EmbeddedManifold.jl#L201

[codecov[bot]]

Codecov Report

Merging #66 (429672f) into master (694b196) will increase coverage by 0.75%. The diff coverage is 100.00%.

:exclamation: Current head 429672f differs from pull request most recent head 1fd5acc. Consider uploading reports for the commit 1fd5acc to get more accurate results

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   98.93%   99.69%   +0.75%     
==========================================
  Files          10       10              
  Lines        1320     1320              
==========================================
+ Hits         1306     1316      +10     
+ Misses         14        4      -10     

Impacted Files	Coverage Δ
src/PowerManifold.jl	99.15% <100.00%> (+4.20%)	:arrow_up:

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