Update fr.gouv.etalab.mastodon.txt

metadata/fr.gouv.etalab.mastodon.txt

@@ -153,6 +153,13 @@ Build:1.6.3,82
     prebuild=sed -i -e '/jcenter()/a\        google()' ../build.gradle && \
         sed -i -e '/safetynetImplementation/d' build.gradle
 
+Build:1.6.6,87
+    commit=1.6.6
+    subdir=app
+    gradle=fdroid
+    prebuild=sed -i -e '/jcenter()/a\        google()' ../build.gradle && \
+        sed -i -e '/playstoreImplementation/d' build.gradle
+
 Auto Update Mode:Version %v
 Update Check Mode:Tags ^[0-9.]+$
 Current Version:1.6.3