Update CHANGES
diff --git a/CHANGES b/CHANGES
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+++ b/CHANGES
@@ -1,7 +1,57 @@
 Revision history for SPIRV-Tools
 
-v2020.7-dev 2020-12-07
- - Start v2020.7-dev
+v2021.0-dev 2021-02-16
+ - Start SPIRV-Tools v2021.0
+
+v2020.7 2021-02-16
+ - General
+    - Support pending Intel extensions (#4116)
+    - Remove WebGPU support (#4108)
+ - Validator
+    - Vulkan image gather constant component (#4133)
+    - Add Vulkan PSB64 convert VUID (#4122)
+    - Validate SPV_KHR_workgroup_memory_explicit_layout (#4128)
+    - Validate VK_KHR_zero_initialize_workgroup_memory (#4124)
+    - Add Vulkan image gather offset VUID (#4118)
+    - Label Vulkan atomic semantics VUIDs (#4120)
+    - Label VUID 04662 (#4123)
+    - Label VUID 04683 (#4121)
+    - Add Vulkan EXT builtins (#4115)
+    - Validate Sampled=1 for Vulkan ImageQuerySizeLod, ImageQueryLevels, ImageQueryLod (#4103)
+    - Add Vulkan Memory Scope VUs (#4106)
+    - Add Vulkan Addressing Model check (#4107)
+    - Vulkan atomic storage class (#4079)
+    - Label standalone Vulkan VUID (#4091)
+    - Add Vulkan decroation VUID (#4090)
+    - Add Vulkan FP Mode VUID (#4088)
+    - Fix Vulkan image sampled check (#4085)
+    - Add Vulkan ForwardPointer VUID (#4089)
+    - Add Vulkan ImageTexelPointer format check (#4087)
+    - Add Vulkan Group Operation VUID (#4086)
+    - Add first StandAlone VUID 04633 (#4077)
+    - Add Subgroup VUIDs (#4074)
+    - validate return type of OpImageRead (#4072)
+    - tighter validation of multisampled images (#4059)
+    - validate OpTypeImage Sampled values for environemnts (#4064)
+    - validate StorageImageMultisampled capability (#4062)
+    - Add last TessLevelOuter and TessLevelInner VUID (#4055)
+    - Add last ClipDistance and CullDistance VUID (#4054)
+    - Add last ViewportIndex and Layer VUID (#4053)
+    - Add last Position VUID (#4052)
+    - Allow forward pointer to be used in types generally (#4044)
+ - Optimizer
+    - Mark module as modified if convert-to-half removes decorations. (#4127)
+    - Fix binding number calculation in desc sroa (#4095)
+    - Run DCE when SPV_KHR_shader_clock is used (#4049)
+ - Debug Info
+    - Set correct scope and line info for DebugValue (#4125)
+    - Avoid integrity check failures caused by propagating line instructions (#4096)
+ - Linker
+    - Linker usability improvements (#4084)
+ - Instrumentation
+    - Generate differentiated error codes for buffer oob checking (#4097)
+ - Fuzz
+    - Fix OpPhi handling in DuplicateRegionWithSelection (#4065)
 
 v2020.6 2020-12-07
  - General