Fix missing == in asserts

[odow]

Closes #106

[codecov]

Codecov Report

Merging #107 (b28f1cf) into master (8e39503) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #107   +/-   ##
=======================================
  Coverage   82.96%   82.96%           
=======================================
  Files           3        3           
  Lines        1303     1303           
=======================================
  Hits         1081     1081           
  Misses        222      222           

Impacted Files	Coverage Δ
src/MOI_wrapper.jl	93.05% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8e39503...b28f1cf. Read the comment docs.