Update dependency ember-exam to v4

package.json

@@ -72,7 +72,7 @@
     "ember-concurrency": "1.0.0",
     "ember-data": "3.10.0",
     "ember-drag-drop": "0.4.8",
-    "ember-exam": "3.0.3",
+    "ember-exam": "4.0.0",
     "ember-export-application-global": "2.0.0",
     "ember-fetch": "6.7.0",
     "ember-in-viewport": "3.5.8",

yarn.lock

@@ -5010,10 +5010,10 @@ ember-drag-drop@0.4.8:
   dependencies:
     ember-cli-babel "^6.6.0"
 
-ember-exam@3.0.3:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/ember-exam/-/ember-exam-3.0.3.tgz#07ae10c5a224afa736bc6d28b141f55999382284"
-  integrity sha512-LLkSA5LNFggFpEtEb9GuXkidvyzAWBVpKiyahP5CfM9VGi/Rxw2OLGliH3nrjrJKFrptWUgBnNcRdB1/iLlfMg==
+ember-exam@4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/ember-exam/-/ember-exam-4.0.0.tgz#e7698ba4d792ba2e25a6dc8d92865cea94d2b65b"
+  integrity sha512-VVDlIYRy4rjzXhFEI8a7uw7hByN2Zaoom0Yl96m/IyDe9PXIT6qYGrn3XCRjjnFU6WC4+2jQWbM5CpXsRA3AVQ==
   dependencies:
     chalk "^2.1.0"
     cli-table3 "^0.5.1"
@@ -5023,7 +5023,7 @@ ember-exam@3.0.3:
     fs-extra "^8.0.1"
     js-yaml "^3.13.1"
     rimraf "^2.6.2"
-    semver "^6.1.1"
+    semver "^6.1.2"
     silent-error "^1.1.1"
 
 ember-export-application-global@2.0.0:
@@ -10650,7 +10650,7 @@ schema-utils@^1.0.0:
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.0.tgz#790a7cf6fea5459bac96110b29b60412dc8ff96b"
   integrity sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==
 
-semver@^6.0.0, semver@^6.1.1:
+semver@^6.0.0, semver@^6.1.1, semver@^6.1.2:
   version "6.2.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-6.2.0.tgz#4d813d9590aaf8a9192693d6c85b9344de5901db"
   integrity sha512-jdFC1VdUGT/2Scgbimf7FSx9iJLXoqfglSF+gJeuNWVpiE37OIbc1jywR/GJyFdz3mnkz2/id0L0J/cr0izR5A==