prepare for 5.2.0 release

CONTRIBUTORS

@@ -16,7 +16,6 @@ The following list of authors was automatically generated from the XChange proje
 
     git log --format='%aN' | sort -u
 
-
 AGP-PC\AliGökalp
 Aaron Jang
 AbstractBike
@@ -80,6 +79,7 @@ Cray Imperative
 Cristian Lucaci
 Cryptonit Exchange
 Cyril
+Damiano Derin
 Daniel
 Daniel Cohen
 Daniela Hajnikova
@@ -174,6 +174,7 @@ Jianzhong Chen
 Jim Northrup
 Joakim Johansson
 Joe Zhou
+Johan Lindkvist
 Johannes Zweng
 John Bergqvist
 Jonathan Heusser
@@ -182,6 +183,8 @@ Jonathan Tse
 Jonny Heggheim
 Joseph Marcilla
 Josua Troesch
+Juan
+Juan Fernandez
 Julian Liebl
 Juliusz Choinski
 Jure Grabnar
@@ -567,6 +570,7 @@ stevenuray
 straumat
 suchac
 swiesend
+sydowma
 taoruifu
 tbosman
 theluckysuccess
@@ -593,4 +597,4 @@ ww3456
 yalevokhin
 zholmes
 陈晔
-小田謙太郎
+小田謙太郎

README.md

@@ -148,12 +148,12 @@ Add the following dependencies in your pom.xml file. You will need at least xcha
 <dependency>
   <groupId>org.knowm.xchange</groupId>
   <artifactId>xchange-core</artifactId>
-  <version>5.1.1</version>
+  <version>5.2.0</version>
 </dependency>
 <dependency>
   <groupId>org.knowm.xchange</groupId>
   <artifactId>xchange-XYZ</artifactId>
-  <version>5.1.1</version>
+  <version>5.2.0</version>
 </dependency>
 ```
 
@@ -163,7 +163,7 @@ If it is available for your exchange, you may also want to use the streaming API
 <dependency>
   <groupId>org.knowm.xchange</groupId>
   <artifactId>xchange-stream-XYZ</artifactId>
-  <version>5.1.1</version>
+  <version>5.2.0</version>
 </dependency>
 ```
 
@@ -179,7 +179,7 @@ For snapshots, add the following repository to your pom.xml file.
 
 The current snapshot version is:
 
-    5.1.2-SNAPSHOT
+    5.2.1-SNAPSHOT
 
 ## Building with Maven