Bump version to v1.18.x-pre1

BUILD

@@ -66,9 +66,9 @@ config_setting(
 # This should be updated along with build.yaml
 g_stands_for = "goose"
 
-core_version = "7.0.0-dev"
+core_version = "7.0.0-pre1"
 
-version = "1.18.0-dev"
+version = "1.18.0-pre1"
 
 GPR_PUBLIC_HDRS = [
     "include/grpc/support/alloc.h",

build.yaml

@@ -12,9 +12,9 @@ settings:
   '#08': Use "-preN" suffixes to identify pre-release versions
   '#09': Per-language overrides are possible with (eg) ruby_version tag here
   '#10': See the expand_version.py for all the quirks here
-  core_version: 7.0.0-dev
+  core_version: 7.0.0-pre1
   g_stands_for: goose
-  version: 1.18.0-dev
+  version: 1.18.0-pre1
 filegroups:
 - name: alts_proto
   headers:

doc/g_stands_for.md

@@ -17,4 +17,4 @@
 - 1.15 'g' stands for ['glider'](https://github.com/grpc/grpc/tree/v1.15.x)
 - 1.16 'g' stands for ['gao'](https://github.com/grpc/grpc/tree/v1.16.x)
 - 1.17 'g' stands for ['gizmo'](https://github.com/grpc/grpc/tree/v1.17.x)
-- 1.18 'g' stands for ['goose'](https://github.com/grpc/grpc/tree/master)
+- 1.18 'g' stands for ['goose'](https://github.com/grpc/grpc/tree/v1.18.x)