Update Changelog for 1.8 version

CHANGELOG.md

@@ -1,3 +1,21 @@
+## 1.8.0 (September 2015)
+- New MATERIAL DESIGN theme
+- Updated FILE TYPE ICONS
+- Preview TXT files within the app
+- COPY files & folders
+- Preview the full file/folder name from the long press menu
+- Set a file as FAVORITE (kept-in-sync) from the CONTEXT MENU
+- Updated CONFLICT RESOLUTION dialog (wording)
+- Updated background for images with TRANSPARENCY in GALLERY
+- Hidden files will not enforce list view instead of GRID VIEW (folders from Picasa & others)
+- Security:
+  + Updated network stack with security fixes (Jackrabbit 2.10.1)
+- Bugs fixed:
+  + Fixed crash when ETag is lost
+  + Passcode creation not restarted on device rotation
+  + Recovered share icon shown on folders 'shared with me'
+  + User name added to subject when sending a share link through e-mail (fixed on SAMLed apps)
+
 ## 1.7.2 (July 2015)
 - New navigation drawer
 - Improved Passcode