Improve README (#187)

Be explicit about linuxdeployqt's filename (because [explicit is better than implicit](https://www.python.org/dev/peps/pep-0020/)).
Relative paths don't need a `./` prefix.
uploadtool now creates `continuous` branches with a suffix, and the `exclude` list should respect that.

README.md

@@ -101,11 +101,11 @@ script:
   - make -j$(nproc)
   - make INSTALL_ROOT=appdir -j$(nproc) install ; find appdir/
   - wget -c -q "https://github.com/probonopd/linuxdeployqt/releases/download/continuous/linuxdeployqt-continuous-x86_64.AppImage"
-  - chmod a+x linuxdeployqt*.AppImage
+  - chmod a+x linuxdeployqt-continuous-x86_64.AppImage
   - unset QTDIR; unset QT_PLUGIN_PATH ; unset LD_LIBRARY_PATH
   - export VERSION=$(git rev-parse --short HEAD) # linuxdeployqt uses this for naming the file
-  - ./linuxdeployqt*.AppImage ./appdir/usr/share/applications/*.desktop -bundle-non-qt-libs
-  - ./linuxdeployqt*.AppImage ./appdir/usr/share/applications/*.desktop -appimage
+  - ./linuxdeployqt-continuous-x86_64.AppImage appdir/usr/share/applications/*.desktop -bundle-non-qt-libs
+  - ./linuxdeployqt-continuous-x86_64.AppImage appdir/usr/share/applications/*.desktop -appimage
 
 after_success:
   - find ./appdir -executable -type f -exec ldd {} \; | grep " => /usr" | cut -d " " -f 2-3 | sort | uniq
@@ -116,7 +116,7 @@ after_success:
 branches:
   except:
     - # Do not build tags that we create when we upload to GitHub Releases
-    - /^(?i:continuous)$/
+    - /^(?i:continuous)/
 ```
 
 When you save your change, then Travis CI should build and upload an AppImage for you. More likely than not, some fine-tuning will still be required.