Update coverage config to ignore dummy app

[robert-allan-frank]

• fix ember cli code coverage config to ignore dummy app router

[codecov-io]

Codecov Report

Merging #9 into develop will increase coverage by 20%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           develop     #9    +/-   ##
=======================================
+ Coverage       80%   100%   +20%     
=======================================
  Files            8      7     -1     
  Lines           20     14     -6     
=======================================
- Hits            16     14     -2     
+ Misses           4      0     -4

Impacted Files	Coverage Δ
tests/dummy/app/router.js

---

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 f5ee223...5e78f6c. Read the comment docs.