chore: release 1.15.0

[release-please]

🤖 I have created a release *beep* *boop*

1.15.0 (2020-09-01)

Features

• extend channel priming logic to also send fake requests (#398) (6f1ead2)
• deps: adopt flatten plugin and google-cloud-shared-dependencies (#350) (2298596)

Bug Fixes

• temporarily disable reporting to unblock releases (#395) (a56a0f8)

Dependencies

• update dependency com.google.cloud:google-cloud-shared-dependencies to v0.8.6 (#377) (bdae336)
• update dependency com.google.cloud:google-cloud-shared-dependencies to v0.9.0 (#402) (08f7d84)

---

This PR was generated with Release Please.

[codecov]

Codecov Report

Merging #401 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #401   +/-   ##
=========================================
  Coverage     80.42%   80.42%           
  Complexity     1113     1113           
=========================================
  Files           105      105           
  Lines          6897     6897           
  Branches        369      369           
=========================================
  Hits           5547     5547           
  Misses         1150     1150           
  Partials        200      200           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6f1ead2...efc34c8. Read the comment docs.

[yoshi-automation]

Release is at https://github.com/googleapis/java-bigtable/releases/tag/v1.15.0

[release-tool-publish-reporter]

The release build has started, the log can be viewed here. 🌻

[release-tool-publish-reporter]

🥚 You hatched a release! The release build finished successfully! 💜