cache updates (#2052)

diff --git a/tool/since/dart_sdk.yaml b/tool/since/dart_sdk.yaml
index 25111b4..7f99402 100644
--- a/tool/since/dart_sdk.yaml
+++ b/tool/since/dart_sdk.yaml
@@ -1,3 +1,10 @@
+2.8.0-dev.20.0 : 0.1.114
+2.8.0-dev.19.0 : 0.1.114
+2.8.0-dev.18.0 : 0.1.114
+2.8.0-dev.17.0 : 0.1.113
+2.8.0-dev.16.0 : 0.1.113
+2.8.0-dev.15.0 : 0.1.112
+2.7.2 : 0.1.104
 2.8.0-dev.14.0 : 0.1.112
 2.8.0-dev.13.0 : 0.1.112
 2.8.0-dev.12.0 : 0.1.112