chore(ci): another sad attempt to fix travis deployment (puppeteer#3769)

Apparently all the issues happen because we switched from travis.org
to travis.com. So this enctryption key was generated with:

```sh
travis encrypt <KEY> --add deploy.api_key --com --repo
GoogleChrome/puppeteer
```

.travis.yml

@@ -33,7 +33,7 @@ deploy:
   provider: npm
   email: [email protected]
   api_key:
-    secure: KGnYnr2xvszDqSf6ochCynlSaHCIaTg3hjITTLA4a7g1KvihXi81da3Ze0JVOO4femTqtCK5RibB20NhDfYrQIAAk2TjPbnl8xZnT8iW/oy5FfKN9gj36ys5s0Meqrvr4B1il+Bt43IG8M5A1231C7XOGG8ry0fDVjRVanAShHsVg4MUQVJC4ztwVE4VbbIYumPlKOK80i2LB0fIRPdySDXZqlCoCZgBXIw1JYELmJgshuMkPAnrCK0Qz7Q9P1yrl+Ku7Wg/0pqzQ+0N54WiGRzC+zNMx9vWAgKOZS6MtXnuFHFWeql+XE+o1rIn4n2al59+0wucjGfs5n1gOlqD8AK7bNZMKlOpDX3MS77eSDFMNddRpWe1Zo48y56+ArvHDA9l7XGtZ4i48D1vQj5jlFsCyN8JZTohLoKH6+8L9nwvujBII5kXJ+chnj+QS/RXLr+qs7KX5cr5pHfqGPG3hvdwHQ6daM6Y18DF4NlAt4p1i6iYANJjRBHHP3ovB2mc5KVijG/Jo++Qasp7NKY/k1vJr0Nt5tE0X7DHjE2XerIqp0ayBljYzvo7CiiuuNsSOsP5KP9N1jKaJfjjSPBOskCcHmuHeCDZUslJf+LOGsq7oWMNWEItISpiFbeTqcjB7vA/Jj2AmzA+8GY85DvJCMB3XlWWKla4odVU+JSbTNM=
+    secure: 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
   on:
     branch: master
     condition: "$NODE8 = true"