update ddc.vim version

Author: shun

README.md

@@ -1,7 +1,7 @@
 # ddc-vim-lsp
 
 vim-lsp for ddc.vim.
-- ddc.vim : v1.0.0
+- ddc.vim : v1.2.0
 
 ## Required
 

denops/@ddc-sources/vim-lsp.ts

@@ -1,11 +1,11 @@
 import {
   BaseSource,
   Candidate,
-} from "https://deno.land/x/ddc_vim@v1.0.0/types.ts#^";
+} from "https://deno.land/x/ddc_vim@v1.2.0/types.ts#^";
 
 import {
   GatherCandidatesArguments,
-} from "https://deno.land/x/ddc_vim@v1.0.0/base/source.ts#^";
+} from "https://deno.land/x/ddc_vim@v1.2.0/base/source.ts#^";
 
 // deno-lint-ignore ban-types
 type Params = {};