Release master with 0.28 sdk (#34)

Updating samples to use the 0.28.0 release of the SDK

Author: mastermanu

README.md

@@ -47,7 +47,7 @@ choose **Gradle** and then click **Next**->**Finish**.
 
 Run Temporal Server using Docker Compose:
 
-     curl -L https://github.com/temporalio/temporal/releases/download/v0.27.0/docker.tar.gz | tar -xz --strip-components 1 docker/docker-compose.yml
+     curl -L https://github.com/temporalio/temporal/releases/latest/download/docker.tar.gz | tar -xz --strip-components 1 docker/docker-compose.yml
      docker-compose up
 
 If this does not work, see the instructions for running Temporal Server at https://github.com/temporalio/temporal/blob/master/README.md.

build.gradle

@@ -30,7 +30,7 @@ repositories {
 }
 
 dependencies {
-    implementation group: 'io.temporal', name: 'temporal-sdk', version: '0.27.0'
+    implementation group: 'io.temporal', name: 'temporal-sdk', version: '0.28.0'
     implementation group: 'commons-configuration', name: 'commons-configuration', version: '1.10'
     implementation group: 'ch.qos.logback', name: 'logback-classic', version: '1.2.3'
 
@@ -78,4 +78,4 @@ task runHello {
             }
         }
     }
-}
+}