Set minimum stability and reformat composer.json

composer.json

@@ -1,37 +1,43 @@
 {
-	"name": "silverstripe/textextraction",
-	"type": "silverstripe-vendormodule",
-	"description": "Text Extraction API for SilverStripe CMS (mostly used with 'fulltextsearch' module)",
-	"homepage": "http://silverstripe.org",
-	"license": "BSD-3-Clause",
-	"keywords": ["silverstripe", "fulltext", "pdf"],
-	"authors": [
-		{
-			"name": "SilverStripe",
-			"homepage": "http://silverstripe.com"
-		},
-		{
-			"name": "The SilverStripe Community",
-			"homepage": "http://silverstripe.org"
-		}
-	],
-	"require": {
-		"php": ">=5.6",
-		"silverstripe/framework": "^4",
-		"guzzlehttp/guzzle": "~6.3.0",
-		"symfony/event-dispatcher": "^2.6.0@stable",
-		"symfony/http-foundation": "^2.6.0",
-		"silverstripe/assets": "^1"
-	},
-	"require-dev": {
-		"phpunit/phpunit": "^5.7"
-	},
-	"suggest": {
-		"ext-fileinfo": "Improved support for file mime detection"
-	},
-	"extra": {
-		"branch-alias": {
-			"dev-master": "3.x-dev"
-		}
-	}
+    "name": "silverstripe/textextraction",
+    "type": "silverstripe-vendormodule",
+    "description": "Text Extraction API for SilverStripe CMS (mostly used with 'fulltextsearch' module)",
+    "homepage": "http://silverstripe.org",
+    "license": "BSD-3-Clause",
+    "keywords": [
+        "silverstripe",
+        "fulltext",
+        "pdf"
+    ],
+    "authors": [
+        {
+            "name": "SilverStripe",
+            "homepage": "http://silverstripe.com"
+        },
+        {
+            "name": "The SilverStripe Community",
+            "homepage": "http://silverstripe.org"
+        }
+    ],
+    "require": {
+        "php": ">=5.6",
+        "silverstripe/framework": "^4",
+        "guzzlehttp/guzzle": "~6.3.0",
+        "symfony/event-dispatcher": "^2.6.0@stable",
+        "symfony/http-foundation": "^2.6.0",
+        "silverstripe/assets": "^1"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^5.7"
+    },
+    "suggest": {
+        "ext-fileinfo": "Improved support for file mime detection"
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "3.x-dev"
+        }
+    },
+    "minimum-stability": "dev",
+    "prefer-stable": true
 }