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Fix release notes for niche initialization change 

MaybeUninit is not affected by the linked PR.
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Steven Fackler 2020-05-31 14:51:08 -04:00 committed by GitHub
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@ -100,8 +100,8 @@ Compatibility Notes
source file rather than the previous format of `<NAME macros>`.][70969]
**Note:** this may not point a file that actually exists on the user's system.
- [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
- [`mem::{zeroed, uninitialised, MaybeUninit}` will now panic when used with types
that do not allow zero initialization such as `NonZeroU8`.][66059] This was
- [`mem::{zeroed, uninitialised}` will now panic when used with types that do
not allow zero initialization such as `NonZeroU8`.][66059] This was
previously a warning.
- [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
operator has been defined as a saturating operation.][71269] This was previously