build: increment version for V1 release

V1 is a stable C API release, done after almost
3k public commits and about 40 contributors.

A few protocols API were marked as experimental,
since they were recently added to Soletta and
changes are expected:
 * Bluetooth
 * GATT
 * Netctl
 * Mavlink
 * LWM2M

Really nice =)

Signed-off-by: Bruno Dilly <bruno.dilly@intel.com>

tools/build/Makefile.vars

@@ -83,8 +83,8 @@ LIB_ASAN_PATH =
 PREFIX := $(patsubst "%",%,$(PREFIX))
 EXTRA_BINS :=
 
-SOL_VERSION := 0
-SOL_LIB_CURRENT := 0
+SOL_VERSION := 1
+SOL_LIB_CURRENT := 1
 SOL_LIB_REVISION := 0
 SOL_LIB_AGE := 0