v0.5.2

What's Changed

• Added expiration mechanism for ClientCredentialsFlow - it now accepts timeout parameter
• Fixed bug when providing a generator to bulk client without fieldnames - generator used to be exhausted to generate headers and loop generating csv would receive an already exhausted generator, resulting in no data returned. Now generator is 'duplicated' using itertools.tee
• Fixed bug with incorrect csv row counting in bulk v2 - header is no longer counted towards record limit in bulk csv payload

Full Changelog: v0.5.1...v0.5.2