Increment version number to 1.3.1

Author: gaborcsardi

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: gh
 Title: 'GitHub' 'API'
-Version: 1.3.0.9000
+Version: 1.3.1
 Authors@R: c(
     person("Gábor", "Csárdi", , "csardi.gabor@gmail.com", role = c("cre", "ctb")),
     person("Jennifer", "Bryan", role = "aut"),

NEWS.md

@@ -1,5 +1,4 @@
-
-# gh (development version)
+# gh 1.3.1
 
 * gh now accepts lower-case methods i.e. both `gh::gh("get /users/hadley/repos")` and `gh::gh("GET /users/hadley/repos")` work (@maelle, #167).