add gulp-uglify

package.json

@@ -12,14 +12,15 @@
   "devDependencies": {
     "@babel/core": "^7.4.4",
     "browser-sync": "^2.26.3",
+    "bulma": "^0.7.5",
     "gulp": "^3.9.1",
     "gulp-autoprefixer": "^6.0.0",
     "gulp-babel": "^8.0.0",
     "gulp-concat": "^2.6.1",
     "gulp-rename": "^1.4.0",
     "gulp-run": "^1.7.1",
     "gulp-sass": "^4.0.2",
-    "bulma": "^0.7.5"
+    "gulp-uglify": "^3.0.2"
   },
   "peerDependencies": {
     "react": "^0.16.0",

yarn.lock

@@ -735,7 +735,7 @@ combined-stream@^1.0.6, combined-stream@~1.0.6:
   dependencies:
     delayed-stream "~1.0.0"
 
-commander@^2.19.0:
+commander@^2.19.0, commander@~2.20.0:
   version "2.20.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.0.tgz#d58bb2b5c1ee8f87b0d340027e9e94e222c5a422"
 
@@ -1514,6 +1514,21 @@ gulp-sass@^4.0.2:
     through2 "^2.0.0"
     vinyl-sourcemaps-apply "^0.2.0"
 
+gulp-uglify@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/gulp-uglify/-/gulp-uglify-3.0.2.tgz#5f5b2e8337f879ca9dec971feb1b82a5a87850b0"
+  dependencies:
+    array-each "^1.0.1"
+    extend-shallow "^3.0.2"
+    gulplog "^1.0.0"
+    has-gulplog "^0.1.0"
+    isobject "^3.0.1"
+    make-error-cause "^1.1.1"
+    safe-buffer "^5.1.2"
+    through2 "^2.0.0"
+    uglify-js "^3.0.5"
+    vinyl-sourcemaps-apply "^0.2.0"
+
 gulp-util@^3.0.0:
   version "3.0.8"
   resolved "https://registry.yarnpkg.com/gulp-util/-/gulp-util-3.0.8.tgz#0054e1e744502e27c04c187c3ecc505dd54bbb4f"
@@ -2224,6 +2239,16 @@ lru-cache@^4.0.1:
     pseudomap "^1.0.2"
     yallist "^2.1.2"
 
+make-error-cause@^1.1.1:
+  version "1.2.2"
+  resolved "https://registry.yarnpkg.com/make-error-cause/-/make-error-cause-1.2.2.tgz#df0388fcd0b37816dff0a5fb8108939777dcbc9d"
+  dependencies:
+    make-error "^1.2.0"
+
+make-error@^1.2.0:
+  version "1.3.5"
+  resolved "https://registry.yarnpkg.com/make-error/-/make-error-1.3.5.tgz#efe4e81f6db28cadd605c70f29c831b58ef776c8"
+
 make-iterator@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/make-iterator/-/make-iterator-1.0.1.tgz#29b33f312aa8f547c4a5e490f56afcec99133ad6"
@@ -3655,6 +3680,13 @@ ua-parser-js@0.7.17:
   version "0.7.17"
   resolved "https://registry.yarnpkg.com/ua-parser-js/-/ua-parser-js-0.7.17.tgz#e9ec5f9498b9ec910e7ae3ac626a805c4d09ecac"
 
+uglify-js@^3.0.5:
+  version "3.6.0"
+  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.6.0.tgz#704681345c53a8b2079fb6cec294b05ead242ff5"
+  dependencies:
+    commander "~2.20.0"
+    source-map "~0.6.1"
+
 ultron@~1.1.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/ultron/-/ultron-1.1.1.tgz#9fe1536a10a664a65266a1e3ccf85fd36302bc9c"