Change RTD links to point to master

Fixes #1490

Author: marcelstoer

README.md

@@ -2,7 +2,7 @@
 
 [![Join the chat at https://gitter.im/nodemcu/nodemcu-firmware](https://img.shields.io/gitter/room/badges/shields.svg)](https://gitter.im/nodemcu/nodemcu-firmware?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Build Status](https://travis-ci.org/nodemcu/nodemcu-firmware.svg)](https://travis-ci.org/nodemcu/nodemcu-firmware)
-[![Documentation Status](https://img.shields.io/badge/docs-latest-yellow.svg?style=flat)](http://nodemcu.readthedocs.io/en/latest/)
+[![Documentation Status](https://img.shields.io/badge/docs-master-yellow.svg?style=flat)](http://nodemcu.readthedocs.io/en/master/)
 [![License](https://img.shields.io/badge/license-MIT-blue.svg?style=flat)](https://github.com/nodemcu/nodemcu-firmware/blob/master/LICENSE)
 
 ### A Lua based firmware for ESP8266 WiFi SOC
@@ -45,31 +45,31 @@ wifi.sta.config("SSID", "password")
 
 The entire [NodeMCU documentation](https://nodemcu.readthedocs.io) is maintained right in this repository at [/docs](docs). The fact that the API documentation is mainted in the same repository as the code that *provides* the API ensures consistency between the two. With every commit the documentation is rebuilt by Read the Docs and thus transformed from terse Markdown into a nicely browsable HTML site at [https://nodemcu.readthedocs.io](https://nodemcu.readthedocs.io). 
 
-- How to [build the firmware](https://nodemcu.readthedocs.io/en/dev/en/build/)
-- How to [build the filesystem](https://nodemcu.readthedocs.io/en/dev/en/spiffs/)
-- How to [flash the firmware](https://nodemcu.readthedocs.io/en/dev/en/flash/)
-- How to [upload code and NodeMCU IDEs](https://nodemcu.readthedocs.io/en/dev/en/upload/)
+- How to [build the firmware](https://nodemcu.readthedocs.io/en/master/en/build/)
+- How to [build the filesystem](https://nodemcu.readthedocs.io/en/master/en/spiffs/)
+- How to [flash the firmware](https://nodemcu.readthedocs.io/en/master/en/flash/)
+- How to [upload code and NodeMCU IDEs](https://nodemcu.readthedocs.io/en/master/en/upload/)
 - API documentation for every module
 
 # Releases
 
-Due to the ever-growing number of modules available within NodeMCU, pre-built binaries are no longer made available. Use the automated [custom firmware build service](http://nodemcu-build.com/) to get the specific firmware configuration you need, or consult the [documentation](http://nodemcu.readthedocs.io/en/dev/en/build/) for other options to build your own firmware.
+Due to the ever-growing number of modules available within NodeMCU, pre-built binaries are no longer made available. Use the automated [custom firmware build service](http://nodemcu-build.com/) to get the specific firmware configuration you need, or consult the [documentation](http://nodemcu.readthedocs.io/en/master/en/build/) for other options to build your own firmware.
 
 This project uses two main branches, `master` and `dev`. `dev` is actively worked on and it's also where PRs should be created against. `master` thus can be considered "stable" even though there are no automated regression tests. The goal is to merge back to `master` roughly every 2 months. Depending on the current "heat" (issues, PRs) we accept changes to `dev` for 5-6 weeks and then hold back for 2-3 weeks before the next snap is completed.
 
 A new tag is created every time `dev` is merged back to `master`. They are listed in the [releases section here on GitHub](https://github.com/nodemcu/nodemcu-firmware/releases). Tag names follow the \<SDK-version\>-master_yyyymmdd pattern.
 
 # Support
 
-See [https://nodemcu.readthedocs.io/en/dev/en/support/](https://nodemcu.readthedocs.io/en/dev/en/support/).
+See [https://nodemcu.readthedocs.io/en/master/en/support/](https://nodemcu.readthedocs.io/en/master/en/support/).
 
 # License
 
 [MIT](https://github.com/nodemcu/nodemcu-firmware/blob/master/LICENSE) © [zeroday](https://github.com/NodeMCU)/[nodemcu.com](http://nodemcu.com/index_en.html)
 
 # Build Options
 
-The following sections explain some of the options you have if you want to [build your own NodeMCU firmware](http://nodemcu.readthedocs.io/en/dev/en/build/).
+The following sections explain some of the options you have if you want to [build your own NodeMCU firmware](http://nodemcu.readthedocs.io/en/master/en/build/).
 
 ### Select Modules