Minijinja

- Hide accidentally exposed `Syntax::compile` method.
- Added `undeclared_variables` methods to `Template` and `Expression`. (250)

- Fixed an issue with autoreload not working properly on windows. (249)

- Added `Value::is_number`. (240)
- `TryFrom` for `Value` now converts integers to `f32` and `f64`.
- Added the new `custom_syntax` feature which allows custom delimiters
to be configured. (245)
- Added `Kwargs` abstraction to easier handle keyword arguments.
- Fixed an issue that `Option<T>` was incorrectly picking up `none`
for undefined values.
- The `sort` filter now accepts `reverse`, `attribute` and `case_sensitive`
by keyword argument and sorts case insensitive by default.
- The `dictsort` filter now supports reversing, by value sorting,
and is sorting case insensitive by default.

- The `in` operator now does not fail if the value is undefined and the
undefined behavior is not strict. (235)
- The Python binding now supports finalizers. (238)

- Changed the closure behavior of macros to match the one of Jinja2. (233)
- `Value::from_serializable` will no longer panic on invalid values. Instead
the error is deferred to runtime which makes working with objects possible
that are only partially valid for the runtime environment. (234)

- Added `testutils` module. (221)
- Make it more obvious that serde flatten sometimes does not work. (223)
- Added configurable "undefined" value behavior. (227)
- Make `render!()` reuse the hidden environment.