Update README.md

Jitpack build is failing with the following error

```
> Configure project :
Gradle version Gradle 7.1

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> com.android.builder.errors.EvalIssueException: NDK from ndk.dir at /opt/android-sdk-linux/ndk-bundle had version [21.1.6352462] which disagrees with android.ndkVersion [22.1.7171670]
```

So attempting to manually export an env variable for jitpack which uses ndk 21.1.6352462 instead of the termux default 22.1.7171670 and which is also used by F-Droid

https://jitpack.io/com/github/termux/termux-app/0.115/build.log

https://github.com/jitpack/jitpack.io/blob/master/BUILDING.md#custom-commands

https://gitlab.com/fdroid/fdroiddata/-/blob/master/metadata/com.termux.yml#L726

README.md

@@ -3,6 +3,8 @@
 [![Build status](https://github.com/termux/termux-app/workflows/Build/badge.svg)](https://github.com/termux/termux-app/actions)
 [![Testing status](https://github.com/termux/termux-app/workflows/Unit%20tests/badge.svg)](https://github.com/termux/termux-app/actions)
 [![Join the chat at https://gitter.im/termux/termux](https://badges.gitter.im/termux/termux.svg)](https://gitter.im/termux/termux)
+[![Termux library releases at Jitpack](https://jitpack.io/v/termux/termux-app.svg)](https://jitpack.io/#termux/termux-app)
+
 
 [Termux](https://termux.com) is an Android terminal application and Linux environment.
 

app/build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 android {
     compileSdkVersion project.properties.compileSdkVersion.toInteger()
-    ndkVersion project.properties.ndkVersion
+    ndkVersion = System.getenv("JITPACK_NDK_VERSION") ?: project.properties.ndkVersion
 
     dependencies {
         implementation "androidx.annotation:annotation:1.2.0"
@@ -26,8 +26,8 @@ android {
         applicationId "com.termux"
         minSdkVersion project.properties.minSdkVersion.toInteger()
         targetSdkVersion project.properties.targetSdkVersion.toInteger()
-        versionCode 115
-        versionName "0.115"
+        versionCode 116
+        versionName "0.116"
 
         manifestPlaceholders.TERMUX_PACKAGE_NAME = "com.termux"
         manifestPlaceholders.TERMUX_APP_NAME = "Termux"

jitpack.yml

@@ -0,0 +1,2 @@
+env:
+  JITPACK_NDK_VERSION: "21.1.6352462"

terminal-emulator/build.gradle

@@ -3,7 +3,7 @@ apply plugin: 'maven-publish'
 
 android {
     compileSdkVersion project.properties.compileSdkVersion.toInteger()
-    ndkVersion project.properties.ndkVersion
+    ndkVersion = System.getenv("JITPACK_NDK_VERSION") ?: project.properties.ndkVersion
 
     defaultConfig {
         minSdkVersion project.properties.minSdkVersion.toInteger()
@@ -66,7 +66,7 @@ afterEvaluate {
                 from components.release
                 groupId = 'com.termux'
                 artifactId = 'terminal-emulator'
-                version = '0.115'
+                version = '0.116'
                 artifact(sourceJar)
             }
         }

terminal-view/build.gradle

@@ -45,7 +45,7 @@ afterEvaluate {
                 from components.release
                 groupId = 'com.termux'
                 artifactId = 'terminal-view'
-                version = '0.115'
+                version = '0.116'
                 artifact(sourceJar)
             }
         }

termux-shared/build.gradle

@@ -61,7 +61,7 @@ afterEvaluate {
                 from components.release
                 groupId = 'com.termux'
                 artifactId = 'termux-shared'
-                version = '0.115'
+                version = '0.116'
                 artifact(sourceJar)
             }
         }