Bump core-object from 3.1.3 to 3.1.5

Bumps [core-object](https://github.com/ember-cli/core-object) from 3.1.3 to 3.1.5.
- [Release notes](https://github.com/ember-cli/core-object/releases)
- [Commits](ember-cli/core-object@v3.1.3...v3.1.5)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

yarn.lock

@@ -941,7 +941,7 @@ chalk@^1.0.0, chalk@^1.1.0, chalk@^1.1.1, chalk@^1.1.3:
     strip-ansi "^3.0.0"
     supports-color "^2.0.0"
 
-chalk@^2.0.1:
+chalk@^2.0.0, chalk@^2.0.1:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.1.tgz#18c49ab16a037b6eb0152cc83e3471338215b66e"
   dependencies:
@@ -1071,10 +1071,10 @@ core-js@^2.0.0, core-js@^2.4.0, core-js@^2.4.1:
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.4.1.tgz#4de911e667b0eae9124e34254b53aea6fc618d3e"
 
 core-object@^3.1.3:
-  version "3.1.3"
-  resolved "https://registry.yarnpkg.com/core-object/-/core-object-3.1.3.tgz#df399b3311bdb0c909e8aae8929fc3c1c4b25880"
+  version "3.1.5"
+  resolved "https://registry.yarnpkg.com/core-object/-/core-object-3.1.5.tgz#fa627b87502adc98045e44678e9a8ec3b9c0d2a9"
   dependencies:
-    chalk "^1.1.3"
+    chalk "^2.0.0"
 
 core-util-is@~1.0.0:
   version "1.0.2"