chore: release 5.15.2 (#1468)

🤖 I have created a release \*beep\* \*boop\*
---
### [5.15.2](https://www.github.com/googleapis/nodejs-spanner/compare/v5.15.1...v5.15.2) (2021-09-10)


### Bug Fixes

* never try to create a negative number of sessions ([#1467](https://www.github.com/googleapis/nodejs-spanner/issues/1467)) ([13f5153](https://www.github.com/googleapis/nodejs-spanner/commit/13f51537ab13e0cd5a1fb9142f76796b1911809c))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

Author: release-please[bot]

CHANGELOG.md

@@ -4,6 +4,13 @@
 
 [1]: https://www.npmjs.com/package/nodejs-spanner?activeTab=versions
 
+### [5.15.2](https://www.github.com/googleapis/nodejs-spanner/compare/v5.15.1...v5.15.2) (2021-09-10)
+
+
+### Bug Fixes
+
+* never try to create a negative number of sessions ([#1467](https://www.github.com/googleapis/nodejs-spanner/issues/1467)) ([13f5153](https://www.github.com/googleapis/nodejs-spanner/commit/13f51537ab13e0cd5a1fb9142f76796b1911809c))
+
 ### [5.15.1](https://www.github.com/googleapis/nodejs-spanner/compare/v5.15.0...v5.15.1) (2021-09-08)
 
 

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@google-cloud/spanner",
   "description": "Cloud Spanner Client Library for Node.js",
-  "version": "5.15.1",
+  "version": "5.15.2",
   "license": "Apache-2.0",
   "author": "Google Inc.",
   "engines": {

samples/package.json

@@ -16,7 +16,7 @@
   "dependencies": {
     "@google-cloud/kms": "^2.1.3",
     "@google-cloud/precise-date": "^2.0.0",
-    "@google-cloud/spanner": "^5.15.1",
+    "@google-cloud/spanner": "^5.15.2",
     "yargs": "^16.0.0"
   },
   "devDependencies": {