Load hashes.json properly.

Got an error running Bolt from somewhere else than the Bolt folder due to this.
With this, we can load the file by concatenating script base dir with path to `hashes.json` file. Hence be able to run the script from anywhere on the file system.

bolt.py

@@ -13,6 +13,7 @@ banner()
 
 try:
     import concurrent.futures
+    from pathlib import Path
 except:
     print ('%s Bolt is not compatible with python 2. Please run it with python 3.' % bad)
 
@@ -122,7 +123,8 @@ if len(uniqueTokens) < len(allTokens):
     if not replay:
         print ('%s Further investigation shows that it was a false positive.')
 
-with open('./db/hashes.json') as f:
+p = Path(__file__).parent.joinpath('db/hashes.json')
+with p.open('r') as f:
     hashPatterns = json.load(f)
 
 if not allTokens: