0.3.0

• e48681f Set logger to level INFO
• 76ae860 Add Kerberos authentication support
• 8bfe484 Handle early cancel
• b671bc8 Manually construct url
• d28bc27 Retry with 503 error
• 7cf6473 Retry on KerberosExchangeError
• 16759df Check null for error fields
• be504a9 Make code example in Quick Start complete
• cca2e83 Allow to use existing Presto process
• 307a6a4 Add support for SOCKS proxy
• 80643d2 Fix references to TPC-H
• a8c3276 Fix connection error handling
• 9a6fce3 Expose stacktrace to users
• 51e74fd Allow Presto headers in HTTP headers