Upgrade dev deps

Author: Greg Bowler

composer.json

@@ -27,16 +27,14 @@
 		"katzgrau/klogger": "1.0.*",
 		"matthiasmullie/minify": "1.3.*",
 		"michelf/php-markdown": "1.4.1",
-		"g105b/phpcsv": "1.*",
-		"satooshi/php-coveralls": "0.6.*",
-
-		"phpunit/phpunit": "^5.1",
-
-		"behat/behat": "2.*@stable",
-		"behat/mink": "@stable",
+		"g105b/phpcsv": "1.*"
+	},
+	"require-dev": {
+		"satooshi/php-coveralls": "@stable",
+		"phpunit/phpunit": "@stable",
+		"behat/behat": "@stable",
 		"behat/mink-extension": "@stable",
-		"behat/mink-goutte-driver": "@stable",
-		"fabpot/goutte": "1.*@stable"
+		"behat/mink-goutte-driver": "@stable"
 	},
 
 	"keywords": [