Revert okhttp to 3.12.1

okhttp 3.13.1 doesn't support Android 4.x

Author: seven332

app/build.gradle

@@ -96,7 +96,7 @@ dependencies {
     implementation 'com.github.seven332:yorozuya-thread:0.1.1'
     implementation 'com.github.seven332:yorozuya-collect:0.1.4'
     implementation 'com.h6ah4i.android.widget.advrecyclerview:advrecyclerview:1.0.0'
-    implementation 'com.squareup.okhttp3:okhttp:3.13.1'
+    implementation 'com.squareup.okhttp3:okhttp:3.12.1'
     implementation 'org.ccil.cowan.tagsoup:tagsoup:1.2.1'
     implementation 'org.greenrobot:greendao:2.2.1'
     implementation 'org.jsoup:jsoup:1.11.3'