Release v2.9.1

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This release fixes regressions introduced in v2.9.0 and issues specific for the SQL Anywhere platform.

- Total issues resolved: **11**

**MySQL, Schema Introspection:**

- [3389: Column option "autoincrement" => "auto" causes schema diffs](https://github.com/doctrine/dbal/issues/3389) thanks to @sandermarechal
- [3393: Fixed parsing MySQL create table flags (options without a value)](https://github.com/doctrine/dbal/pull/3393) thanks to @morozov and @AdrianSherwood
- [3398: BC Break in 2.9.0 for MySQL Tables containing partitions](https://github.com/doctrine/dbal/issues/3398) thanks to @bcremer

**SQL Anywhere:**

- [3375: [SQL Anywhere] Fix bound parameter references in PHP 7](https://github.com/doctrine/dbal/pull/3375) thanks to @deeky666
- [3378: [SQL Anywhere] Fix query limit values "0" and "null"](https://github.com/doctrine/dbal/pull/3378) thanks to @deeky666
- [3385: [SQL Anywhere] Fix fetching empty values via fetchAll()](https://github.com/doctrine/dbal/pull/3385) thanks to @deeky666
- [3386: [SQL Anywhere] Fix view schema introspection test](https://github.com/doctrine/dbal/pull/3386) thanks to @deeky666

**Schema Comparison:**

- [3382: Reverted strict comparison back to loose because of a new regression](https://github.com/doctrine/dbal/pull/3382) thanks to @morozov and @Majkl578

**Connections:**

- [3305: Fix Fetch mode query in MasterSlaveConnection](https://github.com/doctrine/dbal/pull/3305) thanks to @BradCrumb

**Cache:**

- [3381: ResultCacheStatement lost its cache capability on fetchAll method](https://github.com/doctrine/dbal/pull/3381) thanks to @roger-codina

**Documentation:**

- [3392: fixed annotations of parameter $columns in Table](https://github.com/doctrine/dbal/pull/3392) thanks to @LukasVitek and @ricardofiorani
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