included another path to search into the JAVA_HOME to support openjdk installed from homebrew. Fixed the example in the README based on the 'test_example.nim' (#77)

Author: SirStone

README.md

@@ -8,9 +8,13 @@ import jnim
 # Import a couple of classes
 jclass java.io.PrintStream of JVMObject:
   proc println(s: string)
+
 jclass java.lang.System of JVMObject:
   proc `out`: PrintStream {.prop, final, `static`.}
 
+# Initialize JVM
+initJNI()
+
 # Call!
 System.`out`.println("This string is printed with System.out.println!")
 ```

jnim/private/jvm_finder.nim

@@ -22,7 +22,8 @@ proc findJvmInPath(p: string): string =
       "jre/lib/libjvm.dylib",
       "jre/lib/amd64/jamvm/libjvm.so",
       "jre/lib/amd64/server/libjvm.so",
-      "lib/server/libjvm.so"
+      "lib/server/libjvm.so",
+      "libexec/lib/server/libjvm.so",
     ]
   for lib in libs:
     let lp = p / lib

tests/test_example.nim

@@ -9,5 +9,6 @@ jclass java.lang.System of JVMObject:
 
 # Initialize JVM
 initJNI()
+
 # Call!
 System.`out`.println("This string is printed with System.out.println!")