chore: relicense with dual mit/apache

Author: rvagg

README.md

@@ -150,10 +150,15 @@ This executable has two commands that operate on files or stdin.
 
 `validate` and `to-json` and `to-schema` take either .ipldsch or .md files. When using .md files, `ipld-schema` will extract any \`\`\` code blocks using the `ipldsch` or `sh` language codes.
 
-## License and Copyright
+## License & Copyright
 
 Copyright 2019 Rod Vagg
 
-Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+Licensed under either of
 
-Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
+ * Apache 2.0, ([LICENSE-APACHE](LICENSE-APACHE) / http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT ([LICENSE-MIT](LICENSE-MIT) / http://opensource.org/licenses/MIT)
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

package.json

@@ -33,7 +33,7 @@
     "ipld-schema": "bin/cli.js"
   },
   "author": "Rod <[email protected]> (http://r.va.gg/)",
-  "license": "Apache-2.0",
+  "license": "(Apache-2.0 AND MIT)",
   "devDependencies": {
     "@types/chai": "^4.3.3",
     "@types/mocha": "^9.1.1",