update readme, remove old images

and properly close stream

README.md

@@ -17,6 +17,7 @@
 * Allow loading Glide typing library
   * not included in the app, as there is no compatible open source library
   * can be extracted from GApps packages ("_swypelibs_"), or downloaded [here](https://github.com/erkserkserks/openboard/tree/master/app/src/main/jniLibs)
+  * if you are concerned about security implications of loading user-provides libraries, please use the _nouserlib_ build variant, which removes this option. If HeliBoard is installed as system app, and _swypelibs_ are available for the system, they will be used.
 * Multilingual typing
 * Load external dictionaries
   * get them [here](https://codeberg.org/Helium314/aosp-dictionaries#dictionaries), or in the [experimental](https://codeberg.org/Helium314/aosp-dictionaries#experimental-dictionaries) section (quality may vary)

app/src/main/java/helium314/keyboard/latin/utils/JniUtils.java

@@ -66,7 +66,9 @@ public final class JniUtils {
                     // if device is locked, this will throw an IllegalStateException
                     wantedChecksum = PreferenceManager.getDefaultSharedPreferences(app).getString(Settings.PREF_LIBRARY_CHECKSUM, wantedChecksum);
                 }
-                final String checksum = ChecksumCalculator.INSTANCE.checksum(new FileInputStream(userSuppliedLibrary));
+                final FileInputStream libStream = new FileInputStream(userSuppliedLibrary);
+                final String checksum = ChecksumCalculator.INSTANCE.checksum(libStream);
+                libStream.close();
                 if (TextUtils.equals(wantedChecksum, checksum)) {
                     // try loading the library
                     System.load(userSuppliedLibrary.getAbsolutePath());