add 20-21 course lecturers (#191)

Author: f3d0t

assets/img/images/mentors/bohdan_kovalchuk.jpg

@@ -73,6 +73,44 @@
     ],
 
     years: [
+      {
+        year: '2020-2021',
+        mentor: [
+          {
+            name: 'Alexandr Ostrovny',
+            language: 'HTML, CSS',
+            img: 'alexander.jpeg',
+            github: 'https://github.com/A-Ostrovnyy',
+            twitter: 'https://twitter.com/Alex_Ostrovny'
+          },
+          {
+            name: 'Nikita Shulipa',
+            language: 'JavaScript',
+            img: 'nikita_shulipa.jpg',
+            github: 'https://github.com/nktssh',
+            twitter: 'https://twitter.com/nktssh'
+          },
+          {
+            name: 'Eugene Obrezkov',
+            language: 'TypeScript',
+            img: 'eugene_obrezkov.jpg',
+            github: 'https://github.com/ghaiklor',
+            twitter: 'https://twitter.com/ghaiklor'
+          },
+          {
+            name: 'Vitalii Ovcharenko',
+            language: 'Javascript',
+            img: 'vitalii_ovcharenko.jpg',
+            github: 'https://github.com/Vitaminvp'
+          },
+          {
+            name: 'Bohdan Kovalchuk',
+            language: 'Javascript',
+            img: 'bohdan_kovalchuk.jpg',
+            github: 'https://github.com/babayK0'
+          }
+        ]
+      },
       {
         year: '2018-2019',
         mentor: [