fix(package.json): fix private package issue (#55)

Remove `private:false` from `package.json`
Fix licence tag

Signed-off-by: Niloy Sikdar <niloysikdar30@gmail.com>

package.json

@@ -1,7 +1,6 @@
 {
   "name": "@leopardslab/react-email",
   "version": "1.2.0",
-  "private": "false",
   "description": "React-based component and utility methods-based lightweight library to provide a common interface for email building",
   "author": {
     "name": "Leopards Lab",
@@ -15,7 +14,7 @@
     "url": "https://github.com/leopardslab/react-email/issues"
   },
   "homepage": "https://github.com/leopardslab/react-email#readme",
-  "license": "Apache License 2.0",
+  "license": "Apache-2.0",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "files": [