0.7.5

[bluss]

• Add as_ptr and as_mut_ptr to ArrayString @YuhanLiin #260
• Add borsh serialization support by @honzasp and @Fuuzetsu #259
• Move length field before before data in ArrayVec and ArrayString by @JakkuSakura #255
• Fix miri error for ZST case in extend by @bluss
• implement AsRef for ArrayString by @Zoybean #218
• Fix typos in changelog by @striezel #241
• Add as_slice, as_mut_slice methods to IntoIter by @clarfonthey #224

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This discussion was created from the release 0.7.5.