Add Type II ANOVA & update README

[codecov-io]

Codecov Report

Merging #4 into master will increase coverage by 1.97%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
+ Coverage   93.18%   95.16%   +1.97%     
==========================================
  Files           1        1              
  Lines          44       62      +18     
==========================================
+ Hits           41       59      +18     
  Misses          3        3

Impacted Files	Coverage Δ
src/ANOVA.jl	95.16% <100%> (+1.97%)	:arrow_up:

---

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 16ad12f...40da6f5. Read the comment docs.

[coveralls]

Pull Request Test Coverage Report for Build 43

• 25 of 25 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+2.0%) to 95.161%

---

Totals
Change from base Build 32:	2.0%
Covered Lines:	59
Relevant Lines:	62

---

💛 - Coveralls