v1.4.0

What's Changed

• Removes unused imports by @thewhaleking in #139
• Improve CachedFetcher by @thewhaleking in #140
• Only use Runtime objects in AsyncSubstrateInterface by @thewhaleking in #141
• python ss58 conversion by @thewhaleking in #143
• fully exhaust query map by @thewhaleking in #144
• Only use v14 decoding for events by @thewhaleking in #145

Full Changelog: v1.3.1...v1.4.0