Update cbindgen requirement from ^0.13 to ^0.15

Updates the requirements on cbindgen to permit the latest version.

Changelog

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)


Properly reject arrays as function arguments (#540)

0.14.3

 * Introduce cbindgen:ignore comment annotation, to allow ignoring items or modules. ([#519](https://github.com/eqrion/cbindgen/issues/519))
 * Support for casts in constant expressions. ([#526](https://github.com/eqrion/cbindgen/issues/526))
 * Make a non-fatal error a warning message. ([#535](https://github.com/eqrion/cbindgen/issues/535))
 * Add a --metadata option to the CLI, to allow passing pre-computed cargo metadata. ([#538](https://github.com/eqrion/cbindgen/issues/538))

0.14.2

 * Fixed minimal dependency versions. ([#507](https://github.com/eqrion/cbindgen/issues/507))
 * Add an option to write pragma once. ([#511](https://github.com/eqrion/cbindgen/issues/511))
 * Fix submodule scanning for implicit Rust 2018 modules. ([#512](https://github.com/eqrion/cbindgen/issues/512))

Commits

83b3be9 v0.15.0
aeb69bc Switch default sorting order for items to "None"
ea919a4 mem::replace -> mem::take
f3d5a20 Support sort_by for constants
6439e6d Support constants with arbitrary types
9669cad Rename ARCHITECTURE.md to internals.md in contributing instructions
56d0799 Use U'...' character literals instead of L'...' character literals
f4b26fe Checkout files with LF line endings
d1d97d4 enumeration: Only propagate derive_ostream annotation if not present.
36a3f8b enumertion: Add a using declaration rather than qualifying all branches.
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svartalf / rust-battery