Make builds reproducible (#98)

We simply need to use a fixed build timestamp to make our build
reproducible.

Author: t-bast

README.md

@@ -52,13 +52,11 @@ Our goal is not to re-implement a full Bitcoin node but to build a library that
   <dependency>
     <groupId>fr.acinq</groupId>
     <artifactId>bitcoin-lib_2.13</artifactId>
-    <version>0.27</version>
+    <version>0.43.2</version>
   </dependency>
 </dependencies>
 ```
 
-The latest snapshot (development) version is 0.28-SNAPSHOT, the latest released version is 0.27.
-
 ## libsecp256k1 support
 
 Bitcoin-lib embeds JNI bindings for libsecp256k1 through [secp256k1-kmp](https://github.com/ACINQ/secp256k1-kmp/).

pom.xml

@@ -3,12 +3,13 @@
     <groupId>fr.acinq</groupId>
     <artifactId>bitcoin-lib_2.13</artifactId>
     <packaging>jar</packaging>
-    <version>0.43.1</version>
+    <version>0.43.2</version>
     <description>Simple Scala Bitcoin library</description>
     <url>https://github.com/ACINQ/bitcoin-lib</url>
     <name>bitcoin-lib</name>
 
     <properties>
+        <project.build.outputTimestamp>2020-01-01T00:00:00Z</project.build.outputTimestamp>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <scala.version>2.13.11</scala.version>
         <scala.version.short>2.13</scala.version.short>