Update data [skip ci]

2019.json | 138 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2020.json |   5 +++
 2 files changed, 143 insertions(+)

2020.json

@@ -0,0 +1,5 @@
+{
+    "year": 2020,
+    "papers": [],
+    "days": []
+}