Do not report codecov until all travis jobs finished

Author: ololobus

Diff for: .travis.yml

@@ -19,6 +19,7 @@ notifications:
         on_success: change
         on_failure: always
 
+# keep in sync with codecov.yml number of builds
 env:
     - PG_VERSION=12 PG_BRANCH=REL_12_STABLE TEST_CASE=tap
     - PG_VERSION=12 PG_BRANCH=REL_12_STABLE TEST_CASE=tap MODE=legacy

Diff for: codecov.yml

@@ -1,3 +1,7 @@
+codecov:
+  notify:
+    after_n_builds: 5 # keep in sync with .travis.yml number of builds
+
 # datapagemap.c/.h are copied from Postgres, so let's remove it
 # from report.  Otherwise, we would have to remove some currently
 # unused methods to do not spoil the report.