Make sure database is closed properly

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@ezerous/eth-identity-provider",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "description": "An Ethereum orbit-db-identity-provider.",
   "license": "MIT",
   "author": "Ezerous <ezerous@gmail.com>",

src/levelUtils.js

@@ -3,20 +3,25 @@ import level from 'level';
 /* Used in development only to store the identity.signatures.publicKey so developers don't have to
 repeatedly sign theOrbitDB creation transaction in MetaMask when React development server reloads
 the app */
-const ethProviderDB = level('ethprovider/identities');
+const ethProviderDBName = 'ethprovider/identities';
 
 async function storeIdentitySignaturePubKey(key, signaturePubKey) {
+  const ethProviderDB = level(ethProviderDBName);
   await ethProviderDB.put(key, signaturePubKey);
+  ethProviderDB.close();
 }
 
 // If it exists, it returns the identity.signatures.publicKey for the given key (key is the
 // concatenation of identity.publicKey + identity.signatures.id)
 async function getIdentitySignaturePubKey(key) {
+  const ethProviderDB = level(ethProviderDBName);
   try {
     return await ethProviderDB.get(key);
   } catch (err) {
     if (err && err.notFound) return null; // Not found
     throw err;
+  } finally {
+    ethProviderDB.close();
   }
 }