Encode the version when fetching npm versions

Author: Ives van Hoorne

packages/app/src/sandbox/npm/fetch-dependencies.js

@@ -105,7 +105,11 @@ async function getAbsoluteDependencies(dependencies: Object) {
     nonAbsoluteDependencies.map(async dep => {
       try {
         const data = await window
-          .fetch(`${host}/api/v1/dependencies/${dep}@${dependencies[dep]}`)
+          .fetch(
+            `${host}/api/v1/dependencies/${dep}@${encodeURIComponent(
+              dependencies[dep]
+            )}`
+          )
           .then(x => x.json())
           .then(x => x.data);