Added 2019 developer survey release to PR page

Why is this change being made?

the 2019 dev survey release was not on the press release page, wanted to add for reference before the 2020 survey comes out.

Does this MR meet the acceptance criteria? YES

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what