Update changelog for 0.26.0-insiders2

Fix 2nd references without preview. (microsoft#4368)

* Fix references bugs.

Merge pull request microsoft#4161 from microsoft/seanmcm/0_25_1_release

Seanmcm/0 25 1 release

Merge pull request microsoft#4115 from microsoft/seanmcm/0_25_0_release

Seanmcm/0 25 0 release

Update changelog for Insiders2.

Fix buggy progress message. (microsoft#4039)

Update package.json version. (microsoft#3948)

Merge pull request microsoft#3869 from microsoft/seanmcm/0_24_0_release

Seanmcm/0 24 0 release

Update changelog for 0.24.0-insiders3. (microsoft#3850)

Update colorization.md to remove (syntactic) identifier (microsoft#3832)