Updated dependencies and added the prefer-stable option in the composer.json

Author: sebprt

composer.json

@@ -14,6 +14,7 @@
         }
     ],
     "minimum-stability": "dev",
+    "prefer-stable": true,
     "config": {
         "bin-dir": "bin"
     },
@@ -23,11 +24,10 @@
         "ext-dom": "*",
         "ext-xmlreader": "*",
         "ext-simplexml": "*",
-        "php-etl/bucket": "^0.1",
-        "psr/log": "^1.1@dev",
-        "box/spout": "^3.1@dev",
-        "php-etl/pipeline": "^0.2",
-        "php-etl/phpunit-extension": "^0.1"
+        "php-etl/bucket": "^0.2.0",
+        "psr/log": "^1.1",
+        "box/spout": "^3.1",
+        "php-etl/phpunit-extension": "^0.2.0"
     },
     "autoload": {
         "psr-4": {