Fix bibtex typo

[codecov[bot]]

Codecov Report

Merging #127 (9bf212a) into master (6c7616c) will increase coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   99.77%   99.81%   +0.04%     
==========================================
  Files          18       18              
  Lines        2187     2188       +1     
==========================================
+ Hits         2182     2184       +2     
+ Misses          5        4       -1     

Impacted Files	Coverage Δ
src/PowerManifold.jl	99.38% <0.00%> (-0.21%)	:arrow_down:
src/ManifoldsBase.jl	99.31% <0.00%> (+1.36%)	:arrow_up:

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[kellertuer]

Thanks :)