diff --git a/.gitignore b/.gitignore
index 790bca4..9e66c10 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 .DS_Store
 node_modules/
 dist/
-dev-example/
+dev-examples/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index de077b4..4f18311 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## v3.1.0
++ `demo.html` moved to `https://github.com/hcodes/demo-snowflakes`.
++ `example/` → `examples/`.
++ Small refactoring.
+
 ## v3.0.0
 + Now snowflakes in SVG format.
 + You can change the color of snowflakes. The property `color: "red"`. Default: `"#5ECDEF"`.
diff --git a/gulpfile.js b/gulpfile.js
index f8e15b6..ccb3356 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -52,21 +52,21 @@ gulp.task('clean', function() {
     return del('dist/*');
 });
 
-gulp.task('dev-example-copy', function() {
+gulp.task('dev-examples-copy', function() {
     return gulp
-        .src('example/*')
-        .pipe(gulp.dest('dev-example/'));
+        .src('examples/*')
+        .pipe(gulp.dest('dev-examples/'));
 });
 
-gulp.task('dev-example', ['dev-example-copy'], function() {
+gulp.task('dev-examples', ['dev-examples-copy'], function() {
     return gulp
-        .src('dev-example/*.html')
+        .src('dev-examples/*.html')
         .pipe($.replace(/https:\/\/unpkg\.com\/magic-snowflakes\//g, '../'))
-        .pipe(gulp.dest('dev-example/'));
+        .pipe(gulp.dest('dev-examples/'));
 });
 
 gulp.task('watch', function() {
     gulp.watch('src/**/*', ['default']);
 });
 
-gulp.task('default', ['js.min', 'dev-example']);
+gulp.task('default', ['js.min', 'dev-examples']);
diff --git a/package-lock.json b/package-lock.json
index f8f1495..23996c4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "magic-snowflakes",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -238,6 +238,15 @@
         }
       }
     },
+    "ansi-cyan": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-cyan/-/ansi-cyan-0.1.1.tgz",
+      "integrity": "sha1-U4rlKK+JgvKK4w2G8vF0VtJgmHM=",
+      "dev": true,
+      "requires": {
+        "ansi-wrap": "0.1.0"
+      }
+    },
     "ansi-escapes": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.0.0.tgz",
@@ -253,6 +262,15 @@
         "ansi-wrap": "0.1.0"
       }
     },
+    "ansi-red": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-red/-/ansi-red-0.1.1.tgz",
+      "integrity": "sha1-jGOPnRCAgAo1PJwoyKgcpHBdlGw=",
+      "dev": true,
+      "requires": {
+        "ansi-wrap": "0.1.0"
+      }
+    },
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -468,9 +486,9 @@
       }
     },
     "babel-eslint": {
-      "version": "8.1.1",
-      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-8.1.1.tgz",
-      "integrity": "sha512-3oP7pacBIJe2wRiMwr0W7a+1G6rnIUVFqSePXtLayBya2/d1X+KnH1nZfCoS8OXPuuVz5lmJtKrHc8TjDVWK+g==",
+      "version": "8.1.2",
+      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-8.1.2.tgz",
+      "integrity": "sha512-IE+glF8t0lLoldylN7JyR8gT7e3jwyuNH2ds8g3UVUwGob/U4iT7Xpsiq2kQ8QGLb0eX4RcQXNqeW6mgPysu9A==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "7.0.0-beta.31",
@@ -2875,17 +2893,26 @@
       }
     },
     "gulp-less": {
-      "version": "3.3.2",
-      "resolved": "https://registry.npmjs.org/gulp-less/-/gulp-less-3.3.2.tgz",
-      "integrity": "sha1-9mNq3MZhUKiQJxn6WZY/x/hipJo=",
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/gulp-less/-/gulp-less-3.4.0.tgz",
+      "integrity": "sha512-qRaENWGzZlzb5xDuocsS51y6An1LWjTmCitOSfCNLTGH2O3/owqAjF0z11wUvlYu7OV6bo7R1KV55vOiQtuEWw==",
       "dev": true,
       "requires": {
         "accord": "0.27.3",
-        "gulp-util": "3.0.8",
         "less": "2.7.3",
         "object-assign": "4.1.1",
+        "plugin-error": "0.1.2",
+        "replace-ext": "1.0.0",
         "through2": "2.0.3",
         "vinyl-sourcemaps-apply": "0.2.1"
+      },
+      "dependencies": {
+        "replace-ext": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/replace-ext/-/replace-ext-1.0.0.tgz",
+          "integrity": "sha1-3mMSg3P8v3w8z6TeWkgMRaZ5WOs=",
+          "dev": true
+        }
       }
     },
     "gulp-load-plugins": {
@@ -3103,7 +3130,7 @@
         "lodash": "4.17.4",
         "make-error-cause": "1.2.2",
         "through2": "2.0.3",
-        "uglify-js": "3.3.1",
+        "uglify-js": "3.3.2",
         "vinyl-sourcemaps-apply": "0.2.1"
       },
       "dependencies": {
@@ -3120,9 +3147,9 @@
           "dev": true
         },
         "uglify-js": {
-          "version": "3.3.1",
-          "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.3.1.tgz",
-          "integrity": "sha512-f2JLNUrb9PAnxxNh0CwUoYEIiUUOQkdOxqDkfvrSbot4zJ7y+da1sfNqZg5tKhamfj5WDU2BAjRBEcLKRZm2SA==",
+          "version": "3.3.2",
+          "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.3.2.tgz",
+          "integrity": "sha512-uZp2gduFfZDDfx0iIAmfKgRTANCooWcFjnFmJ2n8x/+RpBNk97lac1HU5wvZxWZCBbwHmTFDpWAsEhKnQpsM2A==",
           "dev": true,
           "requires": {
             "commander": "2.12.2",
@@ -5112,6 +5139,58 @@
         "pinkie": "2.0.4"
       }
     },
+    "plugin-error": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/plugin-error/-/plugin-error-0.1.2.tgz",
+      "integrity": "sha1-O5uzM1zPAPQl4HQ34ZJ2ln2kes4=",
+      "dev": true,
+      "requires": {
+        "ansi-cyan": "0.1.1",
+        "ansi-red": "0.1.1",
+        "arr-diff": "1.1.0",
+        "arr-union": "2.1.0",
+        "extend-shallow": "1.1.4"
+      },
+      "dependencies": {
+        "arr-diff": {
+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-1.1.0.tgz",
+          "integrity": "sha1-aHwydYFjWI/vfeezb6vklesaOZo=",
+          "dev": true,
+          "requires": {
+            "arr-flatten": "1.1.0",
+            "array-slice": "0.2.3"
+          }
+        },
+        "arr-union": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-2.1.0.tgz",
+          "integrity": "sha1-IPnqtexw9cfSFbEHexw5Fh0pLH0=",
+          "dev": true
+        },
+        "array-slice": {
+          "version": "0.2.3",
+          "resolved": "https://registry.npmjs.org/array-slice/-/array-slice-0.2.3.tgz",
+          "integrity": "sha1-3Tz7gO15c6dRF82sabC5nshhhvU=",
+          "dev": true
+        },
+        "extend-shallow": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-1.1.4.tgz",
+          "integrity": "sha1-Gda/lN/AnXa6cR85uHLSH/TdkHE=",
+          "dev": true,
+          "requires": {
+            "kind-of": "1.1.0"
+          }
+        },
+        "kind-of": {
+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-1.1.0.tgz",
+          "integrity": "sha1-FAo9LUGjbS78+pN3tiwk+ElaXEQ=",
+          "dev": true
+        }
+      }
+    },
     "pluralize": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/pluralize/-/pluralize-7.0.0.tgz",
@@ -5973,6 +6052,15 @@
       "integrity": "sha1-pB6tGm1ggc63n2WwYZAbbY89HQ8=",
       "dev": true
     },
+    "string_decoder": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
+      "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "5.1.1"
+      }
+    },
     "string-width": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
@@ -6000,15 +6088,6 @@
         }
       }
     },
-    "string_decoder": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
-      "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
-      "dev": true,
-      "requires": {
-        "safe-buffer": "5.1.1"
-      }
-    },
     "stringstream": {
       "version": "0.0.5",
       "resolved": "https://registry.npmjs.org/stringstream/-/stringstream-0.0.5.tgz",
diff --git a/package.json b/package.json
index 7f0a83f..8edf709 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "magic-snowflakes",
   "description": "Falling snowflakes",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "author": {
     "name": "Denis Seleznev",
     "email": "hcodes@yandex.ru",