Update required Go version to 1.13 in README.

4 jobs for master in 5 minutes and 16 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #14390
android

00:05:16

passed #14393
debian-testing

00:03:02

passed #14391
go-1.13

00:01:34

passed #14392
go-1.14

00:01:34

 
Name Stage Failure
failed
android Test
fmt
log
gomobile: go build -v -buildmode=c-shared -o=/tmp/gomobile-work-226631279/android/src/main/jniLibs/armeabi-v7a/libgojni.so ./gobind failed: exit status 2

Running after_script
Running after script...
$ echo "Download debug artifacts from https://gitlab.com/${CI_PROJECT_PATH}/-/jobs"
Download debug artifacts from https://gitlab.com/tpo/anti-censorship/pluggable-transports/snowflake/-/jobs
ERROR: Job failed: exit code 1