Drop support for node 4 & 5, node < 6 is EOL'd and no longer maintained.

Author: chriseppstein

.travis.yml

@@ -9,10 +9,6 @@ matrix:
       env: INTEGRATION=true
     - node_js: '6'
       env: INTEGRATION=false
-    - node_js: '5'
-      env: INTEGRATION=false
-    - node_js: '4'
-      env: INTEGRATION=false
 install:
   - npm install -g npm@latest
   - npm ci

CHANGELOG.md

@@ -8,6 +8,7 @@ This release has **BREAKING CHANGES** that were required to fix regressions in 4
 * Named Combinators (E.g. `.a /for/ .b`) are now properly parsed as a combinator.
 * It is now possible to look up a node based on the source location of a character in that node and to query nodes if they contain some character.
 * Several bug fixes that caused the parser to hang and run out of memory when a `/` was encountered have been fixed.
+* The minimum supported version of Node is now v6.0.
 
 ### Changes to the Descendent Combinator
 

package.json

@@ -47,7 +47,7 @@
   },
   "license": "MIT",
   "engines": {
-    "node": ">=4"
+    "node": ">=6"
   },
   "homepage": "https://github.com/postcss/postcss-selector-parser",
   "contributors": [