Think about to fix the issues found by adapter checker

I am an automatic service that looks for possible errors in ioBroker and creates an issue for it. The link below leads directly to the test:

[ ] [E016] No SPDX license found in package.json. Please use one of listed here: https://spdx.org/licenses/
[ ] [E104] No common.titleLang found in io-package.json
[ ] [E114] No adapter are allowed in the repo without admin3 support
[ ] [E116] No SPDX license found. Please use one of listed here: https://spdx.org/licenses/
[ ] [E154] common.dependencies must contain{"js-controller": ">=2.0.0"} or {"js-controller": ">=3.0.0"}
[ ] [E124] Main file not found under URL: https://raw.githubusercontent.com/ioBroker/ioBroker.opcua/master/main.js
[ ] [E504] "main.js found in package.json, but not found as file
[ ] [E300] Not found on travis. Please setup travis

I have also found warnings that may be fixed if possible.

Thanks, your automatic adapter checker.

ioBroker / ioBroker.opcua