3.3

- [x] #84 / #89 Inject on an existing instance with `Container::injectOn()`
- [x] #86 Optimize definition lookup
- [x] #87 Small bug in `PhpDocParser`
- [x] Renaming `injectAll` into `injectOn`
- [x] Documentation for `injectOn`
- [x] News post
- [x] Change log

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