Fix material-ui peer dependency on legacy version

[serut]

Hello,

The last stable version of Material UI V0 is :

    "material-ui": "^0.20.2",

I made this PR because, with the last version of NPM, it blocks the npm install when using Dockerhub node 15 image (on CI) :

Could not resolve dependency:
npm ERR! peer material-ui@"^0.17.4 || ^1.0.0-beta.1" from [email protected]
npm ERR! node_modules/mdi-material-ui
npm ERR!   mdi-material-ui@"^4.33.1" from the root project

I will also fix the following message for all these users that use the legacy version as we are ...

npm i
[...]
npm WARN [email protected] requires a peer of material-ui@^0.17.4 || ^1.0.0-beta.1 but none is installed. You must install peer dependencies yourself.

[leMaik]

Thank you, much appreciated. 👍 I'll publish a new version later.
Edit: Released as v4.33.2