Update doc

README.android

@@ -38,7 +38,7 @@ See `the online manual
 Notes
 -----
 
-aria2c executable was generated using android-ndk-r12b.
+aria2c executable was generated using android-ndk-r14b.
 
 The following libraries were statically linked.
 

README.rst

@@ -359,7 +359,7 @@ Cross-compiling Android binary
 In this section, we describe how to build Android binary using Android
 NDK cross-compiler on Debian Linux.
 
-At the time of this writing, android-ndk-r12b should compile aria2
+At the time of this writing, android-ndk-r14b should compile aria2
 without errors.
 
 ``android-config`` script is a configure script wrapper for Android