Minor typo fixes

[robsyme]

Just updating occurrences of "wether" to "whether".

[codecov-commenter]

Codecov Report

Merging #176 into master will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #176   +/-   ##
=======================================
  Coverage   67.89%   67.89%           
=======================================
  Files          22       22           
  Lines        5631     5631           
=======================================
  Hits         3823     3823           
  Misses       1808     1808           

Impacted Files	Coverage Δ
R/methSeg.R	95.33% <ø> (ø)
R/tabix.functions.R	83.05% <ø> (ø)
src/methCall.cpp	68.70% <ø> (ø)
R/methylDBFunctions.R	59.17% <100.00%> (ø)

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