diff --git a/.travis.yml b/.travis.yml
index 6fbf14c0..b155bea5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,8 +3,10 @@ dist: trusty
 language: node_js
 node_js:
   - node
+install:
+  - npm install -g codecov
 script:
   - npm run ci
-  - npm run codecov
+  - codecov
 notifications:
   email: false
diff --git a/package-lock.json b/package-lock.json
index 7fd3e2e1..5b057c10 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -181,12 +181,6 @@
         "sprintf-js": "~1.0.2"
       }
     },
-    "argv": {
-      "version": "0.0.2",
-      "resolved": "https://registry.npmjs.org/argv/-/argv-0.0.2.tgz",
-      "integrity": "sha1-7L0W+JSbFXGDcRsb2jNPN4QBhas=",
-      "dev": true
-    },
     "aria-query": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-3.0.0.tgz",
@@ -1435,17 +1429,6 @@
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
       "dev": true
     },
-    "codecov": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/codecov/-/codecov-3.0.2.tgz",
-      "integrity": "sha512-9ljtIROIjPIUmMRqO+XuDITDoV8xRrZmA0jcEq6p2hg2+wY9wGmLfreAZGIL72IzUfdEDZaU8+Vjidg1fBQ8GQ==",
-      "dev": true,
-      "requires": {
-        "argv": "0.0.2",
-        "request": "^2.81.0",
-        "urlgrey": "0.4.4"
-      }
-    },
     "collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
@@ -9037,12 +9020,6 @@
       "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
       "dev": true
     },
-    "urlgrey": {
-      "version": "0.4.4",
-      "resolved": "https://registry.npmjs.org/urlgrey/-/urlgrey-0.4.4.tgz",
-      "integrity": "sha1-iS/pWWCAXoVRnxzUOJ8stMu3ZS8=",
-      "dev": true
-    },
     "use": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.0.tgz",
diff --git a/package.json b/package.json
index 8c28349f..e80b252e 100644
--- a/package.json
+++ b/package.json
@@ -6,8 +6,7 @@
   "scripts": {
     "lint": "eslint ./src/*",
     "test": "jest",
-    "ci": "npm run lint && npm run test -- --coverage",
-    "codecov": "codecov"
+    "ci": "npm run lint && npm run test -- --coverage"
   },
   "pre-commit": [
     "lint",
@@ -27,7 +26,9 @@
     "javascript-algorithms",
     "sorting-algorithms",
     "graph",
-    "tree"
+    "tree",
+    "interview",
+    "interview-preparation"
   ],
   "author": "Oleksii Trekhleb (https://www.linkedin.com/in/trekhleb/)",
   "license": "MIT",
@@ -39,7 +40,6 @@
     "@types/jest": "^23.1.4",
     "babel-cli": "^6.26.0",
     "babel-preset-env": "^1.7.0",
-    "codecov": "^3.0.2",
     "eslint": "^4.19.1",
     "eslint-config-airbnb": "^17.0.0",
     "eslint-plugin-import": "^2.13.0",