v5.0.0

• update package.json 69387de
• test naming fix 98bb48e
• Improved network halted handling for case when we cannot connect to any top tier nodes, and a batch of connected peer nodes don't relay top tier externalize messages because they are stuck. If a next batch detects a ledger close, the network is not marked as halted ec5626e
• simplified crawlFactory 671f890
• refactored crawl-state to crawl. Moved properties to Observation when needed. 9760e4c
• Added README c2f2157

v5.0.0-5...v5.0.0