remove support for node < 4

.travis.yml

@@ -1,9 +1,5 @@
 language: node_js
 node_js:
-  - "0.12"
-  - "1"
-  - "2"
-  - "3"
   - "4"
 sudo: false
 script: "make test-travis"

Makefile

@@ -2,16 +2,6 @@ SRC = lib/*.js
 
 include node_modules/make-lint/index.mk
 
-BIN = iojs
-
-ifeq ($(findstring io.js, $(shell which node)),)
-	BIN = node
-endif
-
-ifeq (node, $(BIN))
-	FLAGS = --harmony
-endif
-
 REQUIRED = --require should --require should-http
 
 TESTS = test/application \
@@ -21,14 +11,14 @@ TESTS = test/application \
 	test/experimental/index.js
 
 test:
-	@NODE_ENV=test $(BIN) $(FLAGS) \
+	@NODE_ENV=test node \
 		./node_modules/.bin/_mocha \
 		$(REQUIRED) \
 		$(TESTS) \
 		--bail
 
 test-cov:
-	@NODE_ENV=test $(BIN) $(FLAGS) \
+	@NODE_ENV=test node \
 		./node_modules/.bin/istanbul cover \
 		./node_modules/.bin/_mocha \
 		-- -u exports \
@@ -37,7 +27,7 @@ test-cov:
 		--bail
 
 test-travis:
-	@NODE_ENV=test $(BIN) $(FLAGS) \
+	@NODE_ENV=test node \
 		./node_modules/.bin/istanbul cover \
 		./node_modules/.bin/_mocha \
 		--report lcovonly \

package.json

@@ -53,8 +53,7 @@
     "test-console": "^0.7.1"
   },
   "engines": {
-    "node": ">= 0.12.0",
+    "node": ">= 4"
-    "iojs": ">= 1.0.0"
   },
   "files": [
     "lib"