Amplitude-experiment

Fix

* Do not track empty assignment events ([39](https://github.com/amplitude/experiment-python-server/issues/39)) ([`e2fb39a`](https://github.com/amplitude/experiment-python-server/commit/e2fb39a2642d96278b43a4109ee3adb651f91e3a))

Fix

* Allow creation of multiple client instances based on api key ([38](https://github.com/amplitude/experiment-python-server/issues/38)) ([`b8defe4`](https://github.com/amplitude/experiment-python-server/commit/b8defe43126d48e25e025f1262b0fd01dde19b7f))

Fix

* Update FlagResult class and fix assignment tracking issue ([37](https://github.com/amplitude/experiment-python-server/issues/37)) ([`6a097cf`](https://github.com/amplitude/experiment-python-server/commit/6a097cfebdd3546d2041679c49ecff81c9482588))
* Provide AssignmentConfig class for use ([36](https://github.com/amplitude/experiment-python-server/issues/36)) ([`afbd36c`](https://github.com/amplitude/experiment-python-server/commit/afbd36c80048b9e8d9a4c8fd9dbb211d1fc4b9b1))
* Use relative import in LocalEvaluationConfig ([35](https://github.com/amplitude/experiment-python-server/issues/35)) ([`f5b7897`](https://github.com/amplitude/experiment-python-server/commit/f5b789703b3abb77387ac530526f1550a5a048ed))

Feature

* Automatic assignment tracking ([25](https://github.com/amplitude/experiment-python-server/issues/25)) ([`f3988fd`](https://github.com/amplitude/experiment-python-server/commit/f3988fded773c06888787339f4cfa1a9e8297867))

Fix

* Update evaluation 1.1.1 ([24](https://github.com/amplitude/experiment-python-server/issues/24)) ([`ed5924a`](https://github.com/amplitude/experiment-python-server/commit/ed5924af26c93fc9abad6064d0117513dfb3aa2d))

Fix

* Close http connection when request throws exception ([23](https://github.com/amplitude/experiment-python-server/issues/23)) ([`40c4dbb`](https://github.com/amplitude/experiment-python-server/commit/40c4dbb03961bffaa56138ba5411efda9f2ccd45))