Update changelog and readme

dist/CHANGES.txt

 CHANGES
 
-<master>
+0.8 beta
+- Let's Encrypt (free, automatic, fully-managed HTTPS for your sites)
+- Graceful restarts (for POSIX-compatible systems)
+- Major internal refactoring to allow use of Caddy as library
 - New directive 'mime' to customize Content-Type based on file extension
+- New -accept flag to accept Let's Encrypt SA without prompt
+- New -ca flag to customize ACME CA server URL
+- New -revoke flag to revoke a certificate
+- browse: Render filenames with multiple whitespace properly
+- markdown: Include Last-Modified header in response
+- startup, shutdown: Better Windows support
+- templates: Bug fix for .Host when port is absent
+- templates: Include Last-Modified header in response
+- templates: Support for custom delimiters
+- tls: For non-local hosts, default port is now 443 unless specified
+- tls: Force-disable HTTPS
+- tls: Specify Let's Encrypt email address
+- Many, many more tests and numerous bug fixes and improvements
 
 
 0.7.6 (September 28, 2015)

dist/README.txt

-CADDY 0.7.6
+CADDY 0.8 beta
 
 Website
 	https://caddyserver.com