bump Deno to v0.20.0 (#74)

* bump Deno to v0.20.0

* Update deps.ts

.travis.yml

@@ -1,7 +1,7 @@
 language: generic
 
 install:
-  - curl -fsSL https://deno.land/x/install/install.sh | sh -s v0.19.0
+  - curl -fsSL https://deno.land/x/install/install.sh | sh -s v0.20.0
   - export PATH="$HOME/.deno/bin:$PATH"
 
 services:

deps.ts

@@ -1,21 +1,21 @@
 export {
   BufReader,
   BufWriter
-} from "https://deno.land/std@v0.17.0/io/bufio.ts";
+} from "https://deno.land/std@v0.20.0/io/bufio.ts";
 
-export { copyBytes } from "https://deno.land/std@v0.17.0/io/util.ts";
+export { copyBytes } from "https://deno.land/std@v0.20.0/io/util.ts";
 
 export {
   assert,
   assertEquals,
   assertStrContains,
   assertThrowsAsync
-} from "https://deno.land/std@v0.17.0/testing/asserts.ts";
+} from "https://deno.land/std@v0.20.0/testing/asserts.ts";
 
 export {
   runTests,
   test,
   TestFunction
-} from "https://deno.land/std@v0.17.0/testing/mod.ts";
+} from "https://deno.land/std@v0.20.0/testing/mod.ts";
 
 export { Hash } from "https://deno.land/x/[email protected]/mod.ts";