DOC: Prepare for the NumPy 1.20.0 release.

- Update 1.20.0-notes.rst
- Update 1.20.0-changelog.rst

[ci skip]

doc/changelog/1.20.0-changelog.rst

@@ -193,7 +193,7 @@ names contributed a patch for the first time.
 Pull requests merged
 ====================
 
-A total of 670 pull requests were merged for this release.
+A total of 684 pull requests were merged for this release.
 
 * `#13516 <https://github.com/numpy/numpy/pull/13516>`__: ENH: enable multi-platform SIMD compiler optimizations
 * `#14779 <https://github.com/numpy/numpy/pull/14779>`__: NEP 36 (fair play)
@@ -865,3 +865,17 @@ A total of 670 pull requests were merged for this release.
 * `#18063 <https://github.com/numpy/numpy/pull/18063>`__: BUG: Fix concatenation when the output is "S" or "U"
 * `#18064 <https://github.com/numpy/numpy/pull/18064>`__: BLD, BUG: Fix detecting aarch64 on macOS
 * `#18068 <https://github.com/numpy/numpy/pull/18068>`__: REL: Prepare for 1.20.0rc2 release.
+* `#18108 <https://github.com/numpy/numpy/pull/18108>`__: BUG, BLD: Generate the main dispatcher config header into the...
+* `#18120 <https://github.com/numpy/numpy/pull/18120>`__: BUG, SIMD: Fix _simd module build for 64bit ARM/NEON clang
+* `#18127 <https://github.com/numpy/numpy/pull/18127>`__: REL: Update 1.20.x after 1.19.5 release.
+* `#18130 <https://github.com/numpy/numpy/pull/18130>`__: BUG: Fix promotion of half and string
+* `#18146 <https://github.com/numpy/numpy/pull/18146>`__: BUG, MAINT: improve avx512 mask logical operations
+* `#18154 <https://github.com/numpy/numpy/pull/18154>`__: BUG: Promotion between strings and objects was assymetric
+* `#18192 <https://github.com/numpy/numpy/pull/18192>`__: MAINT: Use explicit reexports for numpy.typing objects
+* `#18201 <https://github.com/numpy/numpy/pull/18201>`__: BUG: Keep ignoring most errors during array-protocol lookup
+* `#18219 <https://github.com/numpy/numpy/pull/18219>`__: MAINT: random shuffle: warn on unrecognized objects, fix empty...
+* `#18231 <https://github.com/numpy/numpy/pull/18231>`__: BLD: update OpenBLAS to af2b0d02
+* `#18237 <https://github.com/numpy/numpy/pull/18237>`__: DOC: Clarify the type alias deprecation message
+* `#18257 <https://github.com/numpy/numpy/pull/18257>`__: BUG: Ensure too many advanced indices raises an exception
+* `#18258 <https://github.com/numpy/numpy/pull/18258>`__: MAINT: add an 'apt update'
+* `#18259 <https://github.com/numpy/numpy/pull/18259>`__: DOC: Prepare for the NumPy 1.20.0 release.

doc/source/release/1.20.0-notes.rst

@@ -3,7 +3,7 @@
 ==========================
 NumPy 1.20.0 Release Notes
 ==========================
-This NumPy release is the largest so made to date, some 670 PRs contributed by
+This NumPy release is the largest so made to date, some 684 PRs contributed by
 184 people have been merged. See the list of highlights below for more details.
 The Python versions supported for this release are 3.7-3.9, support for Python
 3.6 has been dropped. Highlights are