add testthat to Suggests; add RTD badge

DESCRIPTION

@@ -8,7 +8,8 @@ Depends:
     R (>= 3.3.2),
     magrittr
 Suggests:
-    ICC
+    ICC,
+    testthat
 Remotes: hadley/testthat
 License: MIT + file LICENSE
 Encoding: UTF-8

README.md

@@ -1,9 +1,10 @@
 # pwrcalc
 Power calculations in R that produce results familiar to Stata users.
 
-[![Travis-CI Build Status](https://travis-ci.org/vikjam/pwrcalc.svg?branch=master)](https://travis-ci.org/vikjam/pwrcalc)
+[![Travis-CI Build Status](https://travis-ci.org/vikjam/pwrcalc.svg?branch=master)](https://travis-ci.org/vikjam/pwrcalc) [![Documentation Status](https://readthedocs.org/projects/pwrcalc/badge/?version=latest)](http://pwrcalc.readthedocs.io/en/latest/?badge=latest)
+
+## Quick Start
 
-[![Read the Docs](https://readthedocs.org/projects/pwrcalc/?badge=latest)](https://readthedocs.org/projects/vikjam/powercalc/?version=latest)
 
 ### Installation
 

tests/testthat.r

@@ -1,3 +1,4 @@
 library(testthat)
 library(pwrcalc)
-test_check('pwrcalc')
+
+test_check('pwrcalc')