Update flat dependency to the original, but the latest version (#157)

(chore) update flat package

package-lock.json

@@ -806,10 +806,18 @@
       }
     },
     "flat": {
-      "version": "github:lenchvolodymyr/flat#ffe77efe8c33bc80ffb2f7a465537610dea4f611",
-      "from": "github:lenchvolodymyr/flat#ffe77ef",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/flat/-/flat-5.0.0.tgz",
+      "integrity": "sha512-6KSMM+cHHzXC/hpldXApL2S8Uz+QZv+tq5o/L0KQYleoG+GcwrnIJhTWC7tCOiKQp8D/fIvryINU1OZCCwevjA==",
       "requires": {
-        "is-buffer": "~2.0.3"
+        "is-buffer": "~2.0.4"
+      },
+      "dependencies": {
+        "is-buffer": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.4.tgz",
+          "integrity": "sha512-Kq1rokWXOPXWuaMAqZiJW4XxsmD9zGx9q4aePabbn3qCRGedtH7Cm+zV8WETitMfu1wdh+Rvd6w5egwSngUX2A=="
+        }
       }
     },
     "fs.realpath": {
@@ -1043,7 +1051,8 @@
     "is-buffer": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.3.tgz",
-      "integrity": "sha512-U15Q7MXTuZlrbymiz95PJpZxu8IlipAp4dtS3wOdgPXx3mqBnslrWU14kxfHB+Py/+2PVKSr37dMAgM2A4uArw=="
+      "integrity": "sha512-U15Q7MXTuZlrbymiz95PJpZxu8IlipAp4dtS3wOdgPXx3mqBnslrWU14kxfHB+Py/+2PVKSr37dMAgM2A4uArw==",
+      "dev": true
     },
     "is-callable": {
       "version": "1.1.4",

package.json

@@ -88,7 +88,7 @@
     "@phenomnomnominal/tsquery": "^3.0.0",
     "boxen": "^4.1.0",
     "colorette": "^1.1.0",
-    "flat": "github:lenchvolodymyr/flat#ffe77ef",
+    "flat": "5.0.0",
     "gettext-parser": "^4.0.2",
     "glob": "^7.1.4",
     "mkdirp": "^0.5.1",