chore: Allow Angular v5 or v6 as peer dep (#10899)

* chore: Allow Angular v5 or v6 as peer dep

* remove extra =

Author: mmalerba

build-config.js

@@ -13,7 +13,7 @@ const buildVersion = package.version;
  * Required Angular version for all Angular Material packages. This version will be used
  * as the peer dependency version for Angular in all release packages.
  */
-const angularVersion = '^5.0.0';
+const angularVersion = '>=5.0.0 <7.0.0';
 
 /** License that will be placed inside of all created bundles. */
 const buildLicense = `/**