Bump stampit from 4.0.2 to 4.1.1 (#380)

Bumps [stampit](https://github.com/stampit-org/stampit) from 4.0.2 to 4.1.1.
- [Commits](stampit-org/stampit@v4.0.2...v4.1.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -47,7 +47,7 @@
     "react-scripts": "1.1.1",
     "react-test-renderer": "^16.2.0",
     "serve": "^6.5.3",
-    "stampit": "^4.0.2"
+    "stampit": "^4.1.1"
   },
   "scripts": {
     "start": "react-scripts start",

yarn.lock

@@ -7896,9 +7896,9 @@ ssri@^5.2.4:
   dependencies:
     safe-buffer "^5.1.1"
 
-stampit@^4.0.2:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/stampit/-/stampit-4.0.2.tgz#7865b0987747d117970c6262930b5b030865f051"
+stampit@^4.1.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/stampit/-/stampit-4.1.1.tgz#e1827c1f094077d00153ef818234b91e580cecb8"
 
 "statuses@>= 1.3.1 < 2", statuses@~1.4.0:
   version "1.4.0"