[#332] bumped version to 0.9

ChangeLog.md

+Stork 0.9.0 released on 2020-07-01.
+
 * 76 [func] marcin
 
     Pool utilization in the Stork dashboard is shown with a progress bar.

api/swagger.in.yaml

@@ -3,7 +3,7 @@ swagger: "2.0"
 info:
   description: An API for Stork
   title: Stork API
-  version: 0.8.0
+  version: 0.9.0
 consumes:
   - application/json
 produces:

backend/version.go

 package stork
 
-const Version = "0.8.0"
+const Version = "0.9.0"
 
 var BuildDate = "unset"

webui/package-lock.json

 {
     "name": "stork",
-    "version": "0.8.0",
+    "version": "0.9.0",
     "lockfileVersion": 1,
     "requires": true,
     "dependencies": {

webui/package.json

 {
     "name": "stork",
-    "version": "0.8.0",
+    "version": "0.9.0",
     "scripts": {
         "ng": "ng",
         "start": "ng serve",