Prepare for 0.4.0 release

Author: matus-tomlein

CHANGELOG

@@ -1,3 +1,10 @@
+Version 0.4.0 (2022-04-27)
+--------------------------
+Add back-off on 100% event sending failure (#9)
+Add event-level Subject (#61)
+Add IP address property to Subject (#62)
+Rename send_limit to batch_size in Emitter (#63)
+
 Version 0.3.0 (2022-04-19)
 --------------------------
 Add support for Linux in HTTP client (#5)

README.md

@@ -178,7 +178,7 @@ limitations under the License.
 [travis-image]: https://travis-ci.org/snowplow/snowplow-cpp-tracker.png?branch=master
 [travis]: https://travis-ci.org/snowplow/snowplow-cpp-tracker
 
-[release-image]: https://img.shields.io/badge/release-0.3.0-6ad7e5.svg?style=flat
+[release-image]: https://img.shields.io/badge/release-0.4.0-6ad7e5.svg?style=flat
 [releases]: https://github.com/snowplow/snowplow-cpp-tracker/releases
 
 [license-image]: https://img.shields.io/badge/license-Apache--2-blue.svg?style=flat

src/constants.hpp

@@ -21,7 +21,7 @@ using std::string;
 using std::set;
 
 namespace snowplow {
-const string SNOWPLOW_TRACKER_VERSION_LABEL = "cpp-0.3.0";
+const string SNOWPLOW_TRACKER_VERSION_LABEL = "cpp-0.4.0";
 
 // post requests
 const string SNOWPLOW_POST_PROTOCOL_VENDOR = "com.snowplowanalytics.snowplow";