Update cbindgen requirement from ^0.13 to ^0.16

Updates the requirements on cbindgen to permit the latest version.

Changelog

0.16.0

 * Remove artificial restriction on lifetime parameters on enums ([#604](https://github.com/eqrion/cbindgen/issues/604))
 * Add an option for converting usize/isize into size_t/ptrdiff_t. ([#606](https://github.com/eqrion/cbindgen/issues/606))
 * Allow controlling the cargo profile used for expansion. ([#607](https://github.com/eqrion/cbindgen/issues/607))
 * Support wider range of expressions in enum discriminants ([#614](https://github.com/eqrion/cbindgen/issues/614))
 * Support generation of Cython bindings ([#590](https://github.com/eqrion/cbindgen/issues/590))
 * Fixed some issues with style=tag and recursive structs ([#615](https://github.com/eqrion/cbindgen/issues/615))
 * Default C style to Both (as specified in docs) ([#615](https://github.com/eqrion/cbindgen/issues/615))
 * Fix resolution of path dependencies from certain modules. ([#629](https://github.com/eqrion/cbindgen/issues/629))
 * Support inlined definitions for tuple variants with a single field in C ([#631](https://github.com/eqrion/cbindgen/issues/631))

Thanks to all the awesome contributors that contributed to this release.

0.15.0

 * Allow customizing mangling of generic parameters in C ([#575](https://github.com/eqrion/cbindgen/issues/575))
 * Box<T> simplifies to T* in C (4ce324c)
 * ManuallyDrop<T> and MaybeUninit<T> simplify to T in C, and are opaque in C++ (0076a17)
 * C++ supports a derive-ostream annotation to derive serialization of structs, unions and enums ([#582](https://github.com/eqrion/cbindgen/issues/582))
 * Large character constants have been fixed on Windows ([#586](https://github.com/eqrion/cbindgen/issues/586))
 * Constants are now generated for typedefs, etc ([#589](https://github.com/eqrion/cbindgen/issues/589))
 * The `sort_by` configuration option has been made to work for constants ([#587](https://github.com/eqrion/cbindgen/issues/587))
 * Default sort order is source order now (sort_by = "None"), and can be changed by the above option ([#587](https://github.com/eqrion/cbindgen/issues/587))

0.14.6

 * Fixed the builds with older versions of rustc.

0.14.5

 * Add support to specify line ending style ([#568](https://github.com/eqrion/cbindgen/issues/568))
 * Add cbindgen:ptrs-as-arrays annotation to allow making function
   arguments C/C++ arrays.

0.14.4

 * Allow to override the mangling separator ([#502](https://github.com/eqrion/cbindgen/issues/502))


cbindgen now handles better having ZSTs in template parameters, and
default template parameters (#563).


Support for annotating nonnull pointers (#558)


Fixed bitflags that overflow a signed integer (#556)


Support for wildcard argument names (#550)


Support for the never return type, with configurable annotation (#549)

Commits

a00b421 v0.16.0
b82e375 enum: Support inlined definitions for tuple variants with a single field
eaf3e57 enum: Remove some redundant function parameters
0083c43 Remove Struct::tuple_struct
8a5db0b Minor cleanup to fn close_brace
1963f0c Partially support #[cfg]s on fields
dfcee86 enum: Do not forget to rename entities in enum discriminants
fbc2237 parser: Fix resolution of #[path] dependencies from certain modules.
9f558e3 enum: enum_name -> tag_name
8997277 enum: Break up Enum::write into multiple functions
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svartalf / rust-battery