Bump lib version 1.5.5.

Author: arssher

Diff for: META.json

@@ -22,7 +22,7 @@
        "pg_pathman": {
            "file": "pg_pathman--1.5.sql",
            "docfile": "README.md",
-           "version": "1.5.4",
+           "version": "1.5.5",
            "abstract": "Effective partitioning tool for PostgreSQL 9.5 and higher"
       }
    },

Diff for: expected/pathman_calamity.out

@@ -13,7 +13,7 @@ SELECT debug_capture();
 SELECT pathman_version();
  pathman_version 
 -----------------
- 1.5.4
+ 1.5.5
 (1 row)
 
 set client_min_messages = NOTICE;

Diff for: src/include/init.h

@@ -158,7 +158,7 @@ simplify_mcxt_name(MemoryContext mcxt)
 #define LOWEST_COMPATIBLE_FRONT		"1.5.0"
 
 /* Current version of native C library */
-#define CURRENT_LIB_VERSION			"1.5.4"
+#define CURRENT_LIB_VERSION			"1.5.5"
 
 
 void *pathman_cache_search_relid(HTAB *cache_table,