Merge pull request #98 from eimrek/master

update mcloud base_url

src/links/v1/providers.json

@@ -113,7 +113,7 @@
  "attributes": {
  "name": "Materials Cloud",
  "description": "A platform for Open Science built for seamless sharing of resources in computational materials science",
- "base_url": "https://www.materialscloud.org/optimade",
+ "base_url": "https://www.materialscloud.org/optimade/main",
  "homepage": "https://www.materialscloud.org",
  "link_type": "external"
  }