doc: rewrite readme

_dist/README.txt

@@ -2,19 +2,27 @@ A thumbnailing library for Go.
 
 Written in Go
 
-Earlier versions of this project were vendored into `webdir`.
-
-- Supports jpeg / png / gif files (internally) and video files (requires `ffmpeg` in `$PATH`)
-- LRU cache of recent thumbnails for performance
-- Scaling algorithms: Nearest-neighbour or bilinear
-- Aspect ratio preserving (fit outside with image crop; fit inside with transparent background; fit inside with dimension reduction)
-- Output formats: JPG (internal) or transparent PNG (via `go-imagequant`)
+- Supports jpeg / png / gif / bmp / webp files (internally)
+- Supports video files (requires `ffmpeg` in `$PATH`)
+- Optional LRU cache of recent thumbnails for performance
+- Sampling algorithms: Nearest-neighbour, Bilinear (fast), Bilinear (accurate), Bicubic (Catmull-Rom)
+- Scaling algorithms: Fit inside, Fit outside, Stretch
+- Output formats: JPG, PNG, Quantised/lossy PNG (via `go-imagequant`), BMP
 
 A standalone binary `mkthumb` is provided as a sample utility.
 
 =CHANGELOG=
 
-2018-05-04 0.2.1
+2018-06-09 1.0.0
+- Feature: Major speed improvement
+- Feature: Support FitInside, FitOutside, and Stretch stretching modes
+- Feature: Support Bilnear (Fast), Bilnear (Accurate), and Bicubic (Catmull-Rom) scaling algorithms
+- Feature: Support PNG output without imagequant; support BMP output
+- Feature: Support Webp and BMP input files
+- Fix wrong dimension output for video input files
+- Fix jagged output of bilinear resizer
+
+2018-06-04 0.2.1
 - Add `disableimagecrush` build tag option to exclude cgo library dependency
 
 2017-11-18 0.2.0
@@ -24,4 +32,3 @@ A standalone binary `mkthumb` is provided as a sample utility.
 
 2017-01-03 0.1.0
 - Version of `thumbnail` vendored with `webdir` 1.0 (previously tagged as `release-1.0`)
-