fix URLs to CRAN canonical form

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: permute
 Title: Functions for Generating Restricted Permutations of Data
-Version: 0.9-2
+Version: 0.9-3
 Date: 2016-08-08
 Authors@R: c(person(given = "Gavin L.", family = "Simpson",
                     email = "[email protected]",

README.md

@@ -1,7 +1,7 @@
 ## Restricted permutations with R
 
 #### Released version
-[![CRAN version](http://www.r-pkg.org/badges/version/permute)](http://cran.rstudio.com/web/packages/permute/index.html) [![](http://cranlogs.r-pkg.org/badges/grand-total/permute)](http://cran.rstudio.com/web/packages/permute/index.html)
+[![CRAN version](http://www.r-pkg.org/badges/version/permute)](https://cran.r-project.org/package=permute) [![](http://cranlogs.r-pkg.org/badges/grand-total/permute)](https://cran.r-project.org/package=permute)
 
 #### Build status
 [![Build Status](https://travis-ci.org/gavinsimpson/permute.svg?branch=master)](https://travis-ci.org/gavinsimpson/permute)  [![Build status](https://ci.appveyor.com/api/projects/status/ytql5bm7rphweeoh/branch/master?svg=true)](https://ci.appveyor.com/project/gavinsimpson/permute/branch/master)  [![codecov.io](https://codecov.io/github/gavinsimpson/permute/coverage.svg?branch=master)](https://codecov.io/github/gavinsimpson/permute?branch=master)
@@ -26,8 +26,6 @@ Several types of permutation are available in **permute**:
 
 ### References
 
-Besag, J. and Clifford, P. (1989) Generalized Monte Carlo significance 
-tests. *Biometrika* **76**; 633–642.
+Besag, J. and Clifford, P. (1989) Generalized Monte Carlo significance tests. *Biometrika* **76**; 633–642.
 
-ter Braak, C. J. F. (1990). *Update notes: CANOCO version 3.1*. 
-Wageningen: Agricultural Mathematics Group. (UR).
+ter Braak, C. J. F. (1990). *Update notes: CANOCO version 3.1*. Wageningen: Agricultural Mathematics Group. (UR).