Update version number

app/build.gradle

@@ -158,8 +158,8 @@ dependencies {
     testImplementation 'org.robolectric:shadows-multidex:4.2'
 }
 
-def canonicalVersionCode = 139
-def canonicalVersionName = "1.7.1"
+def canonicalVersionCode = 140
+def canonicalVersionName = "1.7.2"
 
 def postFixSize = 10
 def abiPostFix = ['armeabi-v7a' : 1,

app/src/main/java/org/thoughtcrime/securesms/database/helpers/SQLCipherOpenHelper.java

@@ -54,7 +54,6 @@ public class SQLCipherOpenHelper extends SQLiteOpenHelper {
   private static final int lokiV16                          = 37;
   private static final int lokiV17                          = 38;
   private static final int lokiV18_CLEAR_BG_POLL_JOBS       = 39;
-  //TODO Merge all "refactor" migrations to one before pushing to the main repo.
   private static final int lokiV19                          = 40;
   private static final int lokiV20                          = 41;