Update pull_request_template.md:11 ~20 -> twenty (#1398)

I don't think this is a good way of writting like 'If the PR is larger than ~20 lines', it looks weird

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/pull_request_template.md b/docs/pull_request_template.md
index 5e6daf51..26b27ecc 100644
--- a/docs/pull_request_template.md
+++ b/docs/pull_request_template.md
@@ -8,7 +8,7 @@ Any patch work to existing versions will have to create a new branch against the
 # Describe your PR
 
 If the changes has been discussed in an Issue, please tag it so that we can backtrace from the issue later on.<br>
-If the PR is larger than ~20 lines, please describe it here unless described in an issue.
+If the PR is larger than twenty lines, please describe it here unless described in an issue.
 
 # Testing