Update ShellJS version

Thanks!

package-lock.json

@@ -3571,9 +3571,9 @@
       "dev": true
     },
     "interpret": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/interpret/-/interpret-1.0.4.tgz",
-      "integrity": "sha1-ggzdWIuGj/sZGoCVBtbJyPISsbA=",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/interpret/-/interpret-1.1.0.tgz",
+      "integrity": "sha1-ftGxQQxqDg94z5XTuEQMY/eLhhQ=",
       "dev": true
     },
     "invariant": {
@@ -7098,13 +7098,13 @@
       }
     },
     "shelljs": {
-      "version": "0.7.8",
-      "resolved": "https://registry.npmjs.org/shelljs/-/shelljs-0.7.8.tgz",
-      "integrity": "sha1-3svPh0sNHl+3LhSxZKloMEjprLM=",
+      "version": "0.8.1",
+      "resolved": "https://registry.npmjs.org/shelljs/-/shelljs-0.8.1.tgz",
+      "integrity": "sha512-YA/iYtZpzFe5HyWVGrb02FjPxc4EMCfpoU/Phg9fQoyMC72u9598OUBrsU8IrtwAKG0tO8IYaqbaLIw+k3IRGA==",
       "dev": true,
       "requires": {
         "glob": "7.1.2",
-        "interpret": "1.0.4",
+        "interpret": "1.1.0",
         "rechoir": "0.6.2"
       }
     },

package.json

@@ -81,7 +81,7 @@
     "jest": "^22.0.4",
     "node-sass": "^4.7.2",
     "nodemon": "^1.13.0",
-    "shelljs": "^0.7.7",
+    "shelljs": "^0.8.1",
     "supertest": "^3.0.0",
     "ts-jest": "^22.0.4",
     "ts-node": "^5.0.0",