build: bump linter versions and fix failure

Bumps to the latest versions of stylelint and tslint, and fixes a new failure.

Author: crisbeto

package.json

@@ -132,10 +132,10 @@
     "scss-bundle": "^2.0.1-beta.7",
     "selenium-webdriver": "^3.6.0",
     "sorcery": "^0.10.0",
-    "stylelint": "^9.9.0",
+    "stylelint": "^9.10.1",
     "ts-node": "^3.0.4",
     "tsconfig-paths": "^2.3.0",
-    "tslint": "^5.12.0",
+    "tslint": "^5.13.1",
     "tsutils": "^3.0.0",
     "typescript": "~3.1.1",
     "uglify-js": "^2.8.14"

src/lib/card/card.scss

@@ -149,7 +149,7 @@ $mat-card-header-size: 40px !default;
     // As per Material Design specifications, the images exceed the *top* content-box and take
     // up some space. The margin below is necessary because otherwise space of the actual card
     // content will be overlapped.
-    margin: -8px 0 8px 0;
+    margin: -8px 0 8px;
   }
 }