Update yarn:version to account for pre-releases.

Author: Gnuxie

package.json

@@ -20,7 +20,7 @@
     "test:appservice:integration": "NODE_ENV=harness ts-mocha --async-stack-traces --timeout 300000 --project ./tsconfig.json \"test/appservice/integration/**/*Test.ts\"",
     "test:appservice:integration:single": "NODE_ENV=harness npx ts-mocha --timeout 300000 --project ./tsconfig.json",
     "test:manual": "NODE_ENV=harness ts-node test/integration/manualLaunchScript.ts",
-    "version": "sed -i '/# version automated/s/[0-9][0-9]*\\.[0-9][0-9]*\\.[0-9][0-9]*/'$npm_package_version'/' synapse_antispam/setup.py && git add synapse_antispam/setup.py && cat synapse_antispam/setup.py"
+    "version": "sed -i '/# version automated/s/[0-9][0-9]*\\.[0-9][0-9]*\\.[0-9][^\"]*/'$npm_package_version'/' synapse_antispam/setup.py && git add synapse_antispam/setup.py && cat synapse_antispam/setup.py"
   },
   "devDependencies": {
     "@types/config": "^3.3.0",