added code coverage w/ codecov

.Rbuildignore

@@ -1,7 +1,9 @@
 ^ripserr\.Rproj$
 ^\.Rproj\.user$
+^README\.md$
 ^LICENSE\.md$
 ^\.travis\.yml$
 ^appveyor\.yml$
 ^data-raw$
-^.*\.png$
+^.*\.png$
+^codecov\.yml$

.travis.yml

@@ -2,3 +2,5 @@
 
 language: R
 cache: packages
+after_success:
+    - Rscript -e 'covr::codecov()'

DESCRIPTION

@@ -34,4 +34,5 @@ Imports:
     stats (>= 4.0)
 SystemRequirements: C++11
 Suggests: 
-    testthat (>= 2.3)
+    testthat (>= 2.3),
+    covr

README.md

@@ -2,6 +2,7 @@
 
 [![Travis-CI Build Status](https://travis-ci.org/rrrlw/ripserr.svg?branch=master)](https://travis-ci.org/rrrlw/ripserr)
 [![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/github/rrrlw/ripserr?branch=master&svg=true)](https://ci.appveyor.com/project/rrrlw/ripserr)
+[![Codecov test coverage](https://codecov.io/gh/rrrlw/ripserr/branch/master/graph/badge.svg)](https://codecov.io/gh/rrrlw/ripserr?branch=master)
 
 [![License: GPL v3](https://img.shields.io/badge/License-GPL%20v3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
 [![CRAN version](http://www.r-pkg.org/badges/version/ripserr)](https://CRAN.R-project.org/package=ripserr)

codecov.yml

@@ -0,0 +1,14 @@
+comment: false
+
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 1%
+        informational: true
+    patch:
+      default:
+        target: auto
+        threshold: 1%
+        informational: true