switch to alpha instead of canary and ensure alphas have lower preced…

…ense than manual tags

Switching to alpha instead of canary because the semver sorting algorithm is alphabetic and the automated release should always have a lower precendence than manual ones.

Always prefix to the last version even when it's a prerelease so that the ordering is correct, and so that automated alpha releases are able to take precendence over manual ones when new commits are pushed.

Make the prefix `0.alpha` instead of just `alpha` so that it's easy to check if a manual version could be lower than an existing alpha version without dissalowing things like `-rc.0`

See discussion in video-dev#2822

.travis.yml

@@ -12,7 +12,7 @@ env:
     - SAUCE_USERNAME=mangui
 stages:
   - buildAndTest
-  - releaseCanary
+  - releaseAlpha
   - release
   - testFuncRequired
   - testFuncOptional
@@ -39,10 +39,10 @@ jobs:
         skip_cleanup: true
         on:
           tags: true
-    # publish canary package (and deploy gh-pages) if on master
-    - stage: releaseCanary
+    # publish canary package if on master
+    - stage: releaseAlpha
       if: branch = master AND type != pull_request
-      env: TRAVIS_MODE=releaseCanary
+      env: TRAVIS_MODE=releaseAlpha
     # Required tests
     - stage: buildAndTest
       env:   TRAVIS_MODE=build

README.md

@@ -1,6 +1,6 @@
 [![Build Status](https://api.travis-ci.org/video-dev/hls.js.svg?branch=master)](https://travis-ci.org/video-dev/hls.js)
 [![npm](https://img.shields.io/npm/v/hls.js.svg?style=flat)](https://npmjs.org/package/hls.js)
-[![npm](https://img.shields.io/npm/v/hls.js/canary.svg?style=flat)](https://www.npmjs.com/package/hls.js/v/canary)
+[![npm](https://img.shields.io/npm/v/hls.js/alpha.svg?style=flat)](https://www.npmjs.com/package/hls.js/v/alpha)
 [![](https://data.jsdelivr.com/v1/package/npm/hls.js/badge?style=rounded)](https://www.jsdelivr.com/package/npm/hls.js)
 
 [![](https://www.netlify.com/img/global/badges/netlify-color-accent.svg)](https://www.netlify.com)
@@ -58,8 +58,8 @@ Find the commit on [https://github.com/video-dev/hls.js/blob/deployments/README.
 
 ```html
 <script src="https://cdn.jsdelivr.net/npm/hls.js@latest"></script>
-<!-- Or if you want a more recent canary version -->
-<!-- <script src="https://cdn.jsdelivr.net/npm/hls.js@canary"></script> -->
+<!-- Or if you want a more recent alpha version -->
+<!-- <script src="https://cdn.jsdelivr.net/npm/hls.js@alpha"></script> -->
 <video id="video"></video>
 <script>
   var video = document.getElementById('video');
@@ -147,9 +147,9 @@ If you want to bundle the application yourself, use node
 ```
 npm install hls.js
 ```
-or for the version from master (canary)
+or for the version from master (alpha)
 ```
-npm install hls.js@canary
+npm install hls.js@alpha
 ```
 
 **NOTE:** `hls.light.*.js` dist files do not include subtitling and alternate-audio features.