Update jest-diff to remove colors from no diff message

Updates to the latest jest-diff which now supports removing color codes
from "no visual difference" message. A test has been added to confirm
this and prevent regressions in the future.

Fixes #129

Author: alistairjcbrown

__tests__/__snapshots__/snapshotDiff.test.js.snap

@@ -166,6 +166,11 @@ exports[`failed optional deps throws with sensible message on missing react-test
 Cannot find module 'non-existent-module-for-testing' from '__tests__/snapshotDiff.test.js'"
 `;
 
+exports[`no difference 1`] = `
+"Snapshot Diff:
+Compared values have no visual difference."
+`;
+
 exports[`shows diff when comparing React fragments of varying length 1`] = `
 "Snapshot Diff:
 - <FragmentComponent />

__tests__/snapshotDiff.test.js

@@ -267,3 +267,7 @@ describe('failed optional deps', () => {
     ).toThrowErrorMatchingSnapshot();
   });
 });
+
+test('no difference', () => {
+  expect(snapshotDiff('a', 'a')).toMatchSnapshot();
+});

package.json

@@ -22,7 +22,7 @@
     "jest": ">=16"
   },
   "dependencies": {
-    "jest-diff": "^26.0.1",
+    "jest-diff": "^26.1.0",
     "jest-snapshot": "^26.0.1",
     "pretty-format": "^26.0.1"
   },

yarn.lock

@@ -1123,6 +1123,16 @@
     "@types/yargs" "^15.0.0"
     chalk "^4.0.0"
 
+"@jest/types@^26.1.0":
+  version "26.1.0"
+  resolved "https://registry.yarnpkg.com/@jest/types/-/types-26.1.0.tgz#f8afaaaeeb23b5cad49dd1f7779689941dcb6057"
+  integrity sha512-GXigDDsp6ZlNMhXQDeuy/iYCDsRIHJabWtDzvnn36+aqFfG14JmFV0e/iXxY4SP9vbXSiPNOWdehU5MeqrYHBQ==
+  dependencies:
+    "@types/istanbul-lib-coverage" "^2.0.0"
+    "@types/istanbul-reports" "^1.1.1"
+    "@types/yargs" "^15.0.0"
+    chalk "^4.0.0"
+
 "@sinonjs/commons@^1.7.0":
   version "1.7.2"
   resolved "https://registry.yarnpkg.com/@sinonjs/commons/-/commons-1.7.2.tgz#505f55c74e0272b43f6c52d81946bed7058fc0e2"
@@ -3628,6 +3638,16 @@ jest-diff@^26.0.1:
     jest-get-type "^26.0.0"
     pretty-format "^26.0.1"
 
+jest-diff@^26.1.0:
+  version "26.1.0"
+  resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-26.1.0.tgz#00a549bdc936c9691eb4dc25d1fbd78bf456abb2"
+  integrity sha512-GZpIcom339y0OXznsEKjtkfKxNdg7bVbEofK8Q6MnevTIiR1jNhDWKhRX6X0SDXJlwn3dy59nZ1z55fLkAqPWg==
+  dependencies:
+    chalk "^4.0.0"
+    diff-sequences "^26.0.0"
+    jest-get-type "^26.0.0"
+    pretty-format "^26.1.0"
+
 jest-docblock@^26.0.0:
   version "26.0.0"
   resolved "https://registry.yarnpkg.com/jest-docblock/-/jest-docblock-26.0.0.tgz#3e2fa20899fc928cb13bd0ff68bd3711a36889b5"
@@ -4858,6 +4878,16 @@ pretty-format@^26.0.1:
     ansi-styles "^4.0.0"
     react-is "^16.12.0"
 
+pretty-format@^26.1.0:
+  version "26.1.0"
+  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-26.1.0.tgz#272b9cd1f1a924ab5d443dc224899d7a65cb96ec"
+  integrity sha512-GmeO1PEYdM+non4BKCj+XsPJjFOJIPnsLewqhDVoqY1xo0yNmDas7tC2XwpMrRAHR3MaE2hPo37deX5OisJ2Wg==
+  dependencies:
+    "@jest/types" "^26.1.0"
+    ansi-regex "^5.0.0"
+    ansi-styles "^4.0.0"
+    react-is "^16.12.0"
+
 private@^0.1.6:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"