Submit 5.2.0 to CRAN (#259)

* Bump version

* Update changelog

* Update cran-comments.md

Merge pull request #170 from mojaveazure/release/5.0.1

Release/5.0.1

Merge pull request #159 from mojaveazure/release/5.0.0

Release 5.0.0

Merge pull request #123 from mojaveazure/release/4.1.4

Release 4.1.4

Merge pull request #68 from mojaveazure/release/4.1.3

SeuratObject v4.1.3

Merge pull request #45 from mojaveazure/develop

SeuratObject v4.1.0

Merge pull request #35 from mojaveazure/develop

SeuratObject v4.0.4

Merge pull request #28 from mojaveazure/develop

SeuratObject v4.0.3