Update lesson01.md

ichimax · web-flow · commit ee44f2a486d1 · 2021-06-28T19:32:02.000+03:00
diff --git a/lesson/lesson01.md b/lesson/lesson01.md
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 - [Популярность Java-технологий в 2019 году](https://topjava.ru/blog/sostoyanie-java-v-2019-godu)
 - [Java Technology Report 2021](https://www.jrebel.com/blog/2021-java-technology-report)
 - [The State of Developer Ecosystem 2020](https://www.jetbrains.com/lp/devecosystem-2020/java/)
-- [JVM Ecosystem Report 2020](https://snyk.io/wp-content/uploads/jvm_2020.pdf)
+- [JVM Ecosystem Report 2021](https://snyk.io/jvm-ecosystem-report-2021/)
 
 ## ![video](https://cloud.githubusercontent.com/assets/13649199/13672715/06dbc6ce-e6e7-11e5-81a9-04fbddb9e488.png) 3. [Обзор языка Java](https://drive.google.com/open?id=0B_4NpoQW1xfpTU5SSElhUjlGNnc)
 
