fixing stupid mistake while choosing the required version of the lsp4e bundle

Author: martinlippert

eclipse-language-servers/org.springframework.tooling.boot.ls/META-INF/MANIFEST.MF

@@ -12,7 +12,7 @@ Require-Bundle: org.eclipse.jdt.launching;bundle-version="3.9.0",
  org.eclipse.jdt.ui;bundle-version="3.13.0",
  org.eclipse.tm4e.core;bundle-version="0.1.0",
  org.eclipse.tm4e.ui;bundle-version="0.1.0",
- org.eclipse.lsp4e;bundle-version="0.21.0",
+ org.eclipse.lsp4e;bundle-version="0.16.0",
  org.eclipse.lsp4j;bundle-version="0.19.0",
  org.eclipse.lsp4j.jsonrpc;bundle-version="0.19.0",
  org.eclipse.ui.workbench,