update README.md and package.json

README.md

 # Package: com.unity.demoteam.digital-human
 
-Library of tech used to realize the digital human from *The Heretic*.
+Library of tech features used to realize the digital human from *The Heretic*.
 
 
 ## Requirements

package.json

   "displayName": "Demo Team Digital Human",
   "version": "0.1.1-preview",
   "unity": "2019.3",
-  "description": "Library of tech used to realize the digital human from 'The Heretic'.",
+  "description": "Library of tech features used to realize the digital human from 'The Heretic'.",
   "dependencies": {
     "com.unity.demoteam.attributes": "0.1.1-preview",
     "com.unity.burst": "1.2.3",