Clarify deprecation of EXTRA_QT_PLUGINS and update README.md

Closes #197

Author: bjorn

README.md

@@ -57,8 +57,7 @@ Just like all linuxdeploy plugins, the Qt plugin's behavior can be configured so
 **Qt specific:**
 - `$QMAKE=/path/to/my/qmake`: use another `qmake` binary to detect paths of plugins and other resources (usually doesn't need to be set manually, most Qt environments ship scripts changing `$PATH`)
 - `$EXTRA_QT_MODULES=moduleA;moduleB`: Modules to deploy even if not found automatically by linuxdeploy-plugin-qt
-  - example: `EXTRA_QT_MODULES=svg;` if you want to use the module [QtSvg](https://doc.qt.io/qt-5/qtsvg-index.html)
-- `$EXTRA_QT_PLUGINS=pluginA;pluginB`: extra Qt plugins to deploy
+  - Example: `EXTRA_QT_MODULES=svg;` if you want to use the module [QtSvg](https://doc.qt.io/qt-5/qtsvg-index.html)
   - To support Wayland, add `waylandcompositor` to this variable
 - `$EXTRA_PLATFORM_PLUGINS=platformA;platformB`: Platforms to deploy in addition to `libqxcb.so`. Platform must be available from `QT_INSTALL_PLUGINS/platforms`.
   - To support Wayland, add `libqwayland-egl.so;libqwayland-generic.so`

src/main.cpp

@@ -100,7 +100,7 @@ int main(const int argc, const char *const *const argv) {
         ldLog() << LD_ERROR << "No such file or directory:" << qmakePath << std::endl;
         return 1;
     }
-    
+
     ldLog() << "Using qmake:" << qmakePath << std::endl;
 
     auto qmakeVars = queryQmake(qmakePath);
@@ -211,7 +211,7 @@ int main(const int argc, const char *const *const argv) {
         if (ret == nullptr) {
             ret = getenv("EXTRA_QT_PLUGINS");
             if (ret) {
-                ldLog() << std::endl << LD_WARNING << "Using deprecated EXTRA_QT_PLUGINS env var" << std::endl;
+                ldLog() << std::endl << LD_WARNING << "Using deprecated EXTRA_QT_PLUGINS env var (renamed to EXTRA_QT_MODULES)" << std::endl;
             }
         }
         return ret;