Python 3: Use 'filename: learnpython*.py' (no '3')

Before renaming, Python 3 filenames were 'learnpython3*.py'.

This commit removes the '3' part from the filename.

To verify that the filenames were named consistently across
translations prior to this commit, and to change this:

```
ack -H 'filename:' python.html.markdown
find . -name "python-*.markdown" -exec ack -H 'filename:' {} \;

sed -i 's/^filename: learnpython3/filename: learnpython/' \
  python.html.markdown

find . -name "python-*.markdown" -exec \
  sed -i 's/^filename: learnpython3/filename: learnpython/' {} \;
```

1 files changed, 1 insertions, 1 deletions

diff --git a/el-gr/python-gr.html.markdown b/el-gr/python-gr.html.markdown
index d81f4012..203c6e78 100644
--- a/el-gr/python-gr.html.markdown
+++ b/el-gr/python-gr.html.markdown
@@ -8,7 +8,7 @@ contributors:
     - ["evuez", "http://github.com/evuez"]
     - ["Rommel Martinez", "https://ebzzry.io"]
     - ["Roberto Fernandez Diaz", "https://github.com/robertofd1995"]
-filename: learnpython3-gr.py
+filename: learnpython-gr.py
 lang: el-gr
 ---