fix build error and update submodule

app/build.gradle

@@ -40,6 +40,7 @@ dependencies {
     implementation 'com.yydcdut:rxmarkdown-wrapper:0.1.3'
 
     implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+    implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.0.0'
 
     implementation 'com.github.bumptech.glide:glide:4.10.0'
     annotationProcessor 'com.github.bumptech.glide:compiler:4.10.0'

cert4android @ 5245e73c

-Subproject commit 7d42d90fd60e187c826f4de63d687ae94ebaadf4
+Subproject commit 5245e73cb4cabeaafb7b713ca88b9d636aa4eede