Merge pull request #1 from SpeedCurve-Metrics/update-default-module-version

Update default extension version to 20190902

Author: josephwynn-sc

README.md

@@ -24,7 +24,7 @@ This buildpack accepts several config vars:
 
 ### More information: `DDTRACE_EXT_VERSION`
 
-PHP on Heroku is compiled with a specific version of the ddtrace extension. By default, this buildpack enables version `20180731` of the extension. If PHP was compiled with a different version, you will see warnings like this in your application logs:
+PHP on Heroku is compiled with a specific version of the ddtrace extension. By default, this buildpack enables version `20190902` of the extension. If PHP was compiled with a different version, you will see warnings like this in your application logs:
 
 ```
 PHP Warning:  PHP Startup: ddtrace: Unable to initialize module

bin/compile

@@ -72,7 +72,7 @@ topic "Enabling ddtrace PHP extension"
 if [[ -n ${DDTRACE_EXT_VERSION:-} ]]; then
     echo "Using version '$DDTRACE_EXT_VERSION' (from "'$DDTRACE_EXT_VERSION env var).' | indent
 else
-    export DDTRACE_EXT_VERSION="20180731"
+    export DDTRACE_EXT_VERSION="20190902"
     echo "Using version '$DDTRACE_EXT_VERSION' (default value)." | indent
 fi