Re-enble dt-header lint rule.

types/material-ui/index.d.ts

@@ -1,4 +1,4 @@
-// Type definitions for material-ui v0.20.1
+// Type definitions for material-ui 0.21
 // Project: https://github.com/callemall/material-ui
 // Definitions by: Nathan Brown <https://github.com/ngbrown>
 //                 Igor Beagorudsky <https://github.com/theigor>
@@ -519,7 +519,7 @@ declare namespace __MaterialUI {
         >(component: TComponent) => TComponent;
 
         export interface MuiThemeProviderProps {
-            muiTheme?: Styles.MuiTheme;
+            muiTheme?: MuiTheme;
         }
         export class MuiThemeProvider extends React.Component<MuiThemeProviderProps> {
         }
@@ -1864,8 +1864,7 @@ declare namespace __MaterialUI {
             value?: any;
             disabled?: boolean;
         }
-        export class Tab extends React.Component<
-            TabProps, {}> {
+        export class Tab extends React.Component<TabProps> {
         }
     }
 

types/material-ui/material-ui-tests.tsx

@@ -4745,7 +4745,7 @@ class DropDownMenuOpenImmediateExample extends Component<{}, {value?: number}> {
   }
 }
 
-const DropDownMenuAnchorExample: React.SFC<{}> = () => (
+const DropDownMenuAnchorExample: React.SFC = () => (
   <DropDownMenu
     value={1}
     targetOrigin={{ horizontal: 'middle', vertical: 'top' }}

types/material-ui/tsconfig.json

@@ -24,4 +24,4 @@
         "forceConsistentCasingInFileNames": true,
         "esModuleInterop": true
     }
-}
+}

types/material-ui/tslint.json

@@ -3,15 +3,11 @@
     "rules": {
         // TODOs
         "ban-types": false,
-        "dt-header": false,
         "no-any-union": false,
         "no-declare-current-package": false,
         "no-duplicate-imports": false,
         "no-empty-interface": false,
         "no-mergeable-namespace": false,
-        "no-unnecessary-qualifier": false,
-        "no-unnecessary-type-assertion": false,
-        "strict-export-declare-modifiers": false,
-        "use-default-type-parameter": false
+        "strict-export-declare-modifiers": false
     }
-}
+}