update activities

[enriquezrene]

The following request allows updating activities information

curl -X PUT "http://timetracker-api.azurewebsites.net/activities/1" -H "accept: application/json" -H "Content-Type: application/json" -d "{ \"name\": \"Design\", \"description\": \"Some ideas here.\"}"

Where 1 in the URL is the activity ID to be updated

Acceptance Criteria

• The above-mentioned request is executed when an activity is requested to be updated
• All code needs to have at least 80% code coverage
• The activity list is reloaded to show the latest information saved